Refactor: change button image names to more consistent
Refactor 2: change button image variable names to more consistent
New gradient button component NVUIGradientButton
Fixed an error when in lector name excessive whitespaces: now deleting them
Support for more CSS files from Ruseminar. Changed app main color. Changed app main font

Added support for new CSS file: my css.
Now deleting cached css files when refreshing main catalog.
Redesigned way working with CSS files: now using array. Thereby, changed public method in ISAppDelegate class: now returning arrays with description and data of CSS files.

Changed app main color to more blueish.
Changed app main table font Helvetica Neue Bold
Strange storyboard changes
Added new class NVUIGradientButton, added new shell script to check TODO/FIXME comments in code
Released 0.6.6.3 version
Merge branch 'refs/heads/new_setup_screen'