custom error pages; closes #76
improved code readability;
improved code readability and consistency
comments now take into account subscriptions (closes #77), mysql schema for 'likes' system
better buttons for home page; added .flat css class for future reuse
new buttons, broke dependency on metro-buttons library; lazy loading fixes; (un)subscribe fixes for profile
fixed saving of search lists; removed metro-styled buttons lib;
removed references to obsolete styles;
css polishing
minor enhancements
Merge remote-tracking branch 'origin/dev'