Close bugs for milestone 1.1.2 (jeffchan#29)

Fix issues jeffchan#8, jeffchan#11, jeffchan#25. jeffchan#26 + bump version to 1.1.2

Fix issue and bump version to 1.1.1 (jeffchan#24)

Fix issue jeffchan#23, when update is called with an empty string, the content is not updated with an empty string

Auto line height (jeffchan#21)

make lineHeight configuration property optional

Merge pull request jeffchan#17 from Tuizi/update

Update the library to use Gulp, Markdown and new dependencies version

Fix comment

Split out truncate functionality