Adds DB-sensitive tablename escape for backup task.

Uses ActiveRecord::Base.connection.quote_table_name.
Fixes issue 2437.
Merge pull request #3217 from chrislawlor/2437

Adds DB-sensitive tablename escape for backup task.
Show projet name with namespace on team _projects widget
Fix Wiki migration task and add more test coverage.

There was an error in the #extract_attributes_from_page method that
caused an exception when checking to see if a page named "Home"
already exists.

The check occurs to handle the renaming of the main index page to
"Home" to match the Gollum standard. If there is already a page
called "Home" then the migrator will leave that page and create
the Index page as usual. Users will need to manually rename their
old "Home" page to something else then rename their "Index" page
to "Home". Fortunately, I would be highly surprised if this case
ever comes up.

I also added more verbosity to the logging so if an error does
occur, it will be easier to track down which Wiki page is causing
the problem.
Merge pull request #3240 from DanKnox/fix_wiki_migrator

Fix Wiki migration task and add more test coverage.
Fix the order of clearing a satellite
Result of misspellings run.

Most of these are comments but a few are strings for users.

Might be an idea to run this from time to time:
https://github.com/lyda/misspell-check

It runs mostly clean now.
Merge pull request #3243 from lyda/misspellings

Result of misspellings run.
Merge pull request #3242 from murank/fix_failure_of_checking_merge_requests

Fix failure of cheking a merge request after conflict.
Fix project_limit being ignored on signup
Fix bug with downgrade permissions on first project assigment to team
Add control of action in project to team assigment
show project description in project listing on dashboard
Rename project_head partial to settings_nav
Improve usability of project edit page
Abilities added to /user and /sign_in requests
Return own tab for wall. Improve Wiki nav. Removed attachments listing page
feature: wiki -> new page
Move snippets to own tab as feature. Make it disabled for new projects by default
reorder features list in project -> edit page