Added CLANG support and gcov and gprog switches in configure script
Fixed original INSTALL and remove some debug prints on configure.ac
Updated Travis config
Fixed Linux clang link issue
Removed gprof support for problems with LLVM on mac
Fixed Travis issue with gcov and clang3.3
Travis minor fix
Added pkgconfig, minor fixes on scripts and new docummentation

* Added the pkgconfig file
* Added HAVE_CONFIG_H macro in compilation time
* Deleted UNIT_TESTING in the compilation of the libraries
* Minor fixes on configure.ac
* Added Mac and Clang information on usage.md and coverage.md
* Added the corresponding new changes to Makefile.am.dist
Added coverage.md to the installed documentation
Merge pull request #3 from Kerrigan29a/master

Adding support to LLVM Clang and creating configure flags for gcov and gprof