first crack at basic string module functions
Implemented str_set
merge changes from dev
Implemented concat and insert and added unit tests
concat is a special case of insert
str_erase implemented
Fixed segfaulting test for str_erase
Implemented substr
Merge changes from dev
Implemented string compare
Finished initial implementation of string module
Refactored the .c file
started to add doxygen comments
Doxygen comments and more tests
Merge pull request #27 from mikedlowis/string-module

String module