Ticket #112 - Google Analytics

I have implemented the foundation for adding Google Analytics to
the application. The main Google Analytics javascript code has been
included in index.html. It would not do anything until the configuration
file is included as well, which I named tracking.js

All administrators have to do is follow the steps in the README file
to create the tracking.js file and run gulp `(nodemodules/.bin/gulp)
tracking` to include the file in index.html.

Note:
- if the application has already been installed (before this commit),
you will have to run `gulp` to install the dependency gulp-inject
- gulp-inject will not add 'tracking.js' to index.html if the file does
not exist.
- when committing index.html don't commit the line to include
tracking.js. I'm in the process of finding a way to ignore the one line
if it exists. The line is found in the Google Analytics section.
removed answers from the results of querying for a question

- in most cases the answers for the question is not needed; therefore,
the time used to process the information would be wasted. The only
controller that uses the answers as well is the question screen,
where I have inserted another api call for the list of answers.
refactored evaluations review screen to show self-evaluations

- created api function to return all answers with limited information
such as the the text and the attachments.
- created api function for evaluation results with limited information
and have the regular evaluations and self-evaluations to have a common
structure
- added feedback to the evaluations review screen