Merge pull request #174 from yacomink/master

Don't show anchor preview for empty of # hrefs
Updates dist files
new option to support double return
Merge branch 'double-return' of https://github.com/zzjin/medium-editor into zzjin-double-return
Fixes default options spec, changes disabeReturn verification order
README typos
1.7.0
Prevents new lines with shift+enter when disableReturn is set to true
Removes duplication from test files
Removes DOM elements created by MediumEditor on deactivate fixing #164
Formatting
Fixes package.json
Adds extra missing fields to package.json
1.7.1
Changes activate to init the toolbar
1.7.2
Fixes activate/deactivate behavior
1.7.3
Uses delete instead of setting as undefined
Use jsbeautifier to enforce formatting, bump jslint version