Use imperative tense in comments
Merge pull request #65 from hkdobrev/comments-imperative

Use imperative tense in comments
unset brackets should not be separated
improve comments
improve comments
element » block
expression assignments should be separate
ternaries should not do more than assign a value
simplify comments
improve layout of class members
remove trailing line break
refactor parsing of html
read-only fields should be static
simplify names of block types
improve comments
Merge branch 'master' of https://github.com/erusev/parsedown
Update to dirname(__FILE__) instead of __DIR__ so we don't break PHP 5.2