Bugfix for UnityAssertNumbersWithin()

Fixture - require spy or else ignore tests

Fix trailing whitespace CRLF, no code changes

 Make subtraction result unsigned, change prototype & casts in internals.
 If "actual - expected" overflowed, it wrapped to a negative number,
  but would fit in an unsigned type, example is INT_MAX - (-1) = INT_MIN
 For correctness, 'delta' should be unsigned too. Passing in a negative
  number always passed. The delta can be between INT_MAX & UINT_MAX.

 32 or 64 bit test will fail if compiled with -m32 or -m64, repectively
  on clang or gcc
 Fixes to the failures will follow

 Now that the project is using .gitattributes, get rid of CRLF in the repo.

Add tests for printing numbers, interface for spying on output strings (Thanks! I like this idea!)

- tweak docs

Refactor Fixture, no EOL with ignored tests, add a Makefile for Fixture tests 

Fix printing of largest negative number

Include <stdio.h> (for sprintf) when using UNITY_FLOAT_VERBOSE (thanks pacheco017!)

 Add CFLAGS in Fixture Makefile to catch C99 rules with '-pedantic'

 Ignore tests that need the Spy if we are not building with it

 Updated clang and gcc targets. Fixed spelling of LIMITS, which breaks the
  gcc_auto_sizeof.yml build.
 Commented -Wunreachable-code, Unity won't build on OSX clang with it,
  error in unity.c:769 & 932: 'default: break;' case.

 If Unity core is compiled with UNITY_OUTPUT_CHAR = putcharSpy, these tests
  will run, otherwise they are ignored and print a message
 Includes an implementation of putcharSpy, which allows checking the I/O
  from Unity during a test. Follows closely from the Fixture spy
 Tricky macros determine if putcharSpy is injected

 No rake and ruby required to build existing tests

 Don't set CurrentTestFailed = 0 at end, move before last check
 These tests now fail if the output_Spy is not used instead of putchar()

 Revert part of commit 77af37ad, code looked like a temporary change
 The behavior is back to the original, printing "....!..." in quiet mode
 Added an ignored test to Fixture for visual inspection

 Defining a group_runner which calls group_runner_runAll() is redundant

 Using sizeof() instead of constant 4, makes code less fragile to change
 Change name of 'guard' in Guard struct to 'guard_space'

 'divisor' ranges from 1 to 1e18, representable by a long or unsigned long
 'number' becomes negative when cast as signed, so remove the cast and
  keep conversion warnings quiet by turning 'divisor' unsigned

- Fixed a big ugly error in the fancy RUN_TEST handler

- Cleaned up a casting warning error
- Removed a couple semicolons from the end of macros SHAME!

Move UNITY_PRINT_EOL to internals, change to function macro (Thanks, jsalling!)

This helps clarity and is more obvious, it looks like a print function

Delete the { ;} braces and semicolon from UNITY_PRINT_EOL to give it expected
  behavior: 1) requires a semicolon 2) works in one-liner if-else statements
If you need "\r\n" for EOL, define as the following to get the same behavior:
  do{UNITY_OUTPUT_CHAR('\r'); UNITY_OUTPUT_CHAR('\n');}while(0)

Unity fixture needs access to this macro to be consistent.
Add #ifndef wrapper for easier redefinition on systems that use "\r\n".

We're going to use the C99 isinf() and isnan() macros wherever possible now. If your compiler doesn't support this, define UNITY_EXCLUDE_MATH_H and it will go back to the old method

Fix some C++ compatibility issues

docs: fix some typos

The intent of UNITY_WEAK_PRAGMA is that we have weak symbols for setUp
and tearDown in unity.o, so that developers can override these symbols
if needed but the link works right if they are not defined.

In order to do this using #pragma, the pragma and the definition of the
function (not the declaration) need to be present in the same translation
unit (source code file).

Previously, the UNITY_WEAK_PRAGMA code was just declaring the setUp
function, but not defining it, which means that developers had to add an
empty setUp function to their tests in order to link.