answer view is more customizable now

- answer view takes an optional form parameter to override default form. ASKBOT_NEW_ANSWER_FORM settings still works.
- save logic goes to form from view so people can save extra parameters without override view.
Merge pull request #120 from dedeler/customize-answer-view

answer view is more customizable now
fixed the slash in the search query bug
updated the contributors list
fixed typo in  a template
small change in a template
hopefully fixed a bug in processing of incoming email
made changes in the code responsible for detecting email signature
improved user welcoming templates
a change in posting by email
made a change in the email routing
fixed error in email routing
improved handling of user signature extraction
corrected signature change detection
changed a string in settings
adjusted style
recompiled style.css