Removed IRC. Added G+
Remove attribute assignment from code blocks

With Kramdown one can assign HTML attributes to page elements, but such assignment cannot take place inside a fenced code block.
Missing colon
Merge pull request #53 from Vorzard/patch-2

Missing colon
Merge pull request #52 from Vorzard/patch-1

Remove attribute assignment from code blocks
Added Build Tools tutorial. Updated Twitter tips
Added authorInfo and showAuthorInfo metadata to tutorials. <a href="http://youtrack.jetbrains.com/issue/KT-5615>KT-5615</a> fix.
Formatting fixed, unneeded escaping removed
Got rid of obsolete Unit.VALUE
Typo fixed
Typo: mutable property should be var, not val
Merge pull request #55 from JetBrains/formatting

Formatting
Merge pull request #56 from Vorzard/patch-5

Typo: mutable property should be var, not val