fixed formating of README.md
Creating ticket without assignee causes 500
z-index for tip is wrong (ends up behind the text)
Text in tip is aligned incorrectly
Fixes #41

Handle Redmine being installed in a subfolder. It is not the cleanest
fix as inserted inline javascript.
Fixes #54

Fix typos
Merge remote-tracking branch 'upstream/master'
Merge pull request #66 from prmartinuk/master

Fixes for #41 and #54