added hrn-md directive and removed some old code
added hrn-preview directive
generating markdown
added hrn-preview directive
CodeMirror's options moved to separate variable
show\hide hrnMd
repaired preview mode
added compiled styles to gitignore
repaired scrollable preview
fixed: padding
fixed md height
changing preview text after documents switch
fixed building
incrased version
improved app styles
removed Editor service and it's usings
refactored Tab creating constructor
Merge branch 'editor-reorganization'