Fix C89 warnings about variables at top of scope, enums, variadic macros

Clean up IgnoreTest function in Fixture

 Add extern UnityFixture in internals header. Add C89 target in Makefile
 clang will show these warnings but can suppress "//" with -Wno-comment.

 By removing the call to the Conclude function the code is simplified
  and doesn't depend on global state updates. Tests that are ignored
  after the testBody is called still output the right EOL.

Delete function call syntax from Spy detect macros

 This fixes #168. See that github.com issue for more discussion.
 Allows the tests to build when putchar() is defined as a macro
  with parenthesis around it, as in the ARM embedded gcc compiler.

Rename template for testing to be more fitting

UnityPrintFloat overflow fixes. (Thanks pacheco017!)

With a buffer long enough, no truncation should be neccesary to format floats.

Buffer length is user settable by defining UNITY_VERBOSE_NUMBER_MAX_LENGTH,
otherwise a sensible default is used based on desired precision.

See: http://stackoverflow.com/a/7235717

UnityPrintFloat() overflowed with some inputs (eg. FLT_MAX)

Fix additional primitive type conversion warnings on Linux

 Using gcc 4.8 on Ubuntu 14

Clean up int conversion warnings in Fixture

Delete unused Fixture internals functions for failure, ignore, & test counts

Bugfix - line numbers output by Fixture memory checks

Clean up int conversion warnings in core Unity using a 32-bit build

Move Makefile output to build/ directory in Fixture (Thanks jsalling!)

Permissions changed back from -x for testunity.c (Thanks jsalling!)

 Gets rid of warnings about extern with clang's -Weverything

 Turn on -Wconversion in Makefile, fix all warnings

 To expose warnings use -Wconversion -m32, and *not* -D UNITY_SUPPORT_64
 In 32-bit mode, the variable and parameter are the same width, so sign
  conversion is implicit. In 64-bit, implicit conversion is clean.

 Comment out -Wconversion for now, since the build would fail

 These wrapper functions should be in Unity core if warranted.
 Use the Unity struct directly for access, or consider macro functions

 The old failure would print the line in unity_fixture.c, not very useful.
 Now using CurrentTestLineNumber, which is better.

 There was already some space reserved as a guard, added check for writes
 before the beginning of the buffer. Did not change the 'overrun' message.
 Underrun buffer writes are likely to be a more rare case.

Feature - remove dependencies from Fixture, add internal heap option (Wow! Thanks jsalling!)

 This feature removes the dependency on malloc/free for constrained
  embedded systems without a heap. It uses a static heap inside
  Unity Fixture. Setting UNITY_INTERNAL_HEAP_SIZE_BYTES sizes the heap.
 Add tests for new option, add targets to makefile for running tests.
 UNITY_FIXTURE_MALLOC for Fixture use only, remove from unity_output_Spy.c.

Added support for mocks in sub-directories. (Thanks pmendham! This is helpful!)

feedback from @mvandervoord (Thanks).

 Consistent use of one-liners and NULL