[Issue #74][MC] resolved merge conflicts for additional integration between stories C4.S01 and C4.S14
[Issue #74][Finished] integrated add word to database if keyword not found
[Issue #74][Reviewed] corrected some of the code-review comments
[Issue #74][Updating] Changed most of the code acc. to reviewer comments
[Issue #74][Updating] corrected some code convention violations and documentation flaws
[Issue #94] Fixed documentation and code issues in category model
Merge branch 'C4_NourhanMohamed_S01_KeywordQuickSearch' of github.com:MGhanem/smartsoft-13 into C4_m0hamed_S14_AddWordToDatabase

Conflicts:
	arability/app/controllers/keywords_controller.rb
	arability/app/models/keyword.rb
	arability/config/routes.rb