Add config option to control whether abuse button is visible.
Fix page monitoring to include full request URL

The monitoring process for the time spent on a page logs only a partial
URL. This is fixed by using location.href when submitting the background
request.
Merge pull request #298 from wawe/feature-option-show-abuse-button

Add config option to control whether abuse button is visible.
Merge pull request #299 from wawe/fix-page-monitoring-partial-url

Fix page monitoring to include full request URL
Switch to mainline markdown (Fixes #300)
Fix showmore markdown extension after Markdown upgrade

Markdown 2.3 moved whitespace normalization to the normalize_whitespace
preprocessor [0]. This breaks our custom showmore extension.

This commit fixes this breakage by executing the showmore preprocessor
after the normalize_whitespace preprocessor.

[0] waylan/Python-Markdown@e7e23072142eff66719fd633246957d123d78a3d
Workaround for switching client_locations
Add a message when an instance is frozen (hhucn/adhocracy.hhu_theme#182)
Add an option to record external links (hhucn/adhocracy.hhu_theme#)
Remove unused imports
Show registration buttons only if adhocracy.allow_registration is set.

Registration buttons in header and overlay are shown only if
registration is allowed for the adhocracy installation
and an appropriate message is shown for each case.
Allow to add id attribute to watch buttons
Show tutorial step only if follow button is there (fixes #46)
Fix tutorial anchor (fixes #55)
Don't show norms in dashboard if norms aren't used anywhere (fixes #2)
Fix color and size of "argument is contra" (fixes #33)
Perform text is_deleted filter on database side
Fix proposal changes counter (fixes #306)

While at it, calculate count on database side.
Do not require valid email address in the feedback instance

First issue found with selenium tests :)
Remove outdated version fixations (Closes #307)