[feature] added font-size-picker angular directive and updated gulpfile build task to take into account both directives
[feature] added tests for font-size-picker directive
[chore] renamed directive file names and restricting directives to E only
[chore] updated gulpfile to have smaller file names for directives. Updated demo files to reflect new file names
Merge pull request #41 from Rise-Vision/feature/font-size-picker-directive-tests

[feature] font-size-picker directive