Order labels, relationships and property keys in drawer.
Add `:help history` command and frame.
Update :help start information.
Add more tests to ensure the interaction between TransactionEventHandlers and indexes

This verifies that github issues #3590, #2851, #2270 and #2714 are fixed in 2.2.
Update references to docs.neo4j.org to point to neo4j.com/docs.
Browser dependencies version bumps and cleanup.

- Remove commented includes.
- Remove unused dependencies.
- Upgrande font-awsome to 4.2.
- Update jQuery to 2.1.1 and jQuery-UI.
- Update Angular and its reverse dependencies to 1.3.0.
Add test and fix issue with concurrent drop and usage of legacy index.

Legacy index creation and deletion is not transactional, but its availability
was treated as such during the commit to store phase. If a particular index cannot
be found then it has been deliberately removed and thus any changes to it should
be directed to the bitbucket.
Merge pull request #3615 from craigtaverner/master

Small grammar fixes in docs and assertions
Merge pull request #3601 from martinfurmanski/2.2-legacy-index-concurrent-drop

Add test and fix issue with concurrent drop and usage of legacy index.
Serialize identifiers in JSON representation of the Cypher execution plan description

- adding new ExtendedPlanDescription interface with the new needed API and compatibility wrapper for all compilers
Fix typo in package name
Merge pull request #3604 from nawroth/docs-neo4j-org

Update references to docs.neo4j.org to point to neo4j.com/docs.
Reenable a test

- better comments on broken tests
- delete a useless ingored test
Merge pull request #3614 from oskarhane/2.2-version-bump-and-cleanup

Browser dependencies version bumps and cleanup.
Merge pull request #3565 from oskarhane/2.2-update-help-frames

Update Browser help frames.
Merge pull request #3479 from oskarhane/order_metadata_items_sidebar

Order labels, relationships and property keys in drawer.
Updated documentation around performance tuning and execution plans
Further tweaks to tuning and execution plan docs.
Make the PageCache the only way to map files into memory.
Merge pull request #3605 from systay/tuning-docs

Updated documentation around performance tuning and execution plans