Expand equality failure messages with a by-line diff.


git-svn-id: http://googletest.googlecode.com/svn/trunk@691 861a406c-534a-0410-8894-cb66d6ee9925
Mock out GetCurrentDir in NaCl.


git-svn-id: http://googletest.googlecode.com/svn/trunk@692 861a406c-534a-0410-8894-cb66d6ee9925