Added source directory with helper lib and jasmine matcher helpers file
Added definition of stack and its test spec file
Merge branch 'develop' into feature/stack

Conflicts:
	src/lib.js
Merge branch 'develop' into feature/stack
Updated stack code's pop function to not use any local variable and look cooler!
Added new feature to limit the capacity of a stack. Relevant test cases were added too. Also completed the descriptions of API docs.
Merge branch 'feature/stack' into develop