Added Plesk-Driver to Password-Plugin

This Driver allows to change Passwords via Plesk RPC-API
fixed typos and added section in README
Merge pull request #199 from hebbet/master

Updated Langs to TinyMC 4.1.x
Fix incorrect label translation in return receipt (#1489963)
Get rid of some rcube_config::all() calls
Fix font-family/font-size in form elements (#1489936)
Some more css improvements
Support images in HTML signatures (#1488676)
This enables image button and file browser in html editor for signatures
Add forgotten file (for image uploads handling)
Unify default width of resizable UI elements (#1488837)
Small improvements for toolbar buttons style
Display quota information for current folder not INBOX only (#1487993)
Allways return current folder from quota_content()
Support images drag-n-drop into image browser dialog in html signature editor
Typo fix

Missing $ added in get_uids call
Merge pull request #200 from Takika/patch-1

Typo fix
Remove height:auto from .listing table cells
Use treelist widget for folders list in Settings/Folders (#1489648)
Reset also page header/footer on "dummy frames" - to prevent js error e.g. if some script depends on jQuery
Move all filter:(opacity=X) styles to legacy_browser plugin