Merge build branch.

Switch to C language so we can specify operating systems. We have to install ruby 2.1 via rvm because the ruby interpreter on travis ci crashes when running rake ci, however that same version of ruby works fine on my local machine. This work around adds about 6 Minutes to the build and should be replaced as soon as possible to speed up builds.

Add check for linux and move initial CFLAG settings inside linux check. Add
CFLAGS specific to osx and clang to the existing osx/darwin check. Ignore clang warning about default on covered enum switch, look at pull #217 and pull #177 for more info about why that warning is ignored on clang. Ignore unknown clang options so that I don't have to change CFLAG settings elsewhere in the file, clang should just ignore options it dosen't know about.

Suppress output of FAIL messages that are expected during testing Unity itself. (This one makes me so happy! Thanks!)

 Works when using the putcharSpy, transparent without it

Make testunity.c failure output uniform

Fixture C89 comments

 Remove stdint.h from the C89 build due to -pedantic warnings from type
  'long long' and constants like UINTPTR_MAX = 18446744073709551615ULL

Int width detection without sizeof

 CC always exists inside make so ?= doesn't assign to it

 The C preprocessor cannot use sizeof in #if etc.

Cleanup fixture memory testing

 Make it more clear that each test of the internal heap implementation
  should free in LIFO order. Without this check, memory can be stranded
  but still pass.

 The internal malloc must free in LIFO order

 This reverts commit 783fcaea
 The guard memory bytes should never be freed inside unity_malloc()

Update unity_fixture.c (Thanks, Bryon!)

Update unity_fixture_Test.c (Thanks Bryon!)

I believe if realloc() returns a pointer to a different location, the old location is freed. However, the pointer 'n1' is not freed if realloc fails to obtain a large enough block of memory and returns NULL. (more details on [StackOverflow](http://stackoverflow.com/a/16676964)).

Sorry @mvandervoord -- not your code, your repository 😁

Regarding the double free, cppcheck has a check for that too (just saying) 👍

Free guard if UNITY_EXCLUDE_STDLIB_MALLOC is not defined. 👍

Thanks @ for the hint.

[../Unity-master/extras/fixture/test/unity_fixture_Test.c:530]: (error) Deallocating a deallocated pointer: n1

This solution from Daniel Fischer was helpful in fixing the error because if realloc returns a pointer to a different location, the old location is freed.

Found by https://github.com/bryongloden/cppcheck

[../Unity-master/extras/fixture/src/unity_fixture.c:210]: (error) Memory leak: guard

Found by https://github.com/bryongloden/cppcheck

Weak attribute fix for TMS470 Compilers.

Escape backslashes for windows paths, fixes #137.

Change-Id: I901bf192d3c06457d67c6d3a64bdb9aea22c53c2