Fixed some errant tab characters

These must have slipped in while working on my laptop. Gah!
Set version back to 1.0-SNAPSHOT again
Minor update to credits text file
Moved launcher CSS into assessment.css
Minor fix to (temp) logic in AdhocService
Fixed long-standing JQTI JavaDoc issues with 'A'

For some reason, the word 'a' was always written as 'A' in the Javadoc,
which has always annoyed me! I've applied a regexp to (mostly) fix this.
Merge remote-tracking branch 'origin/master'
WIP: Refactoring of candidate session access ctrl
Fixed NPE in 'equal' when toleranceMode is missing.
Renamed TimeLimit -> TimeLimits

This has been named wrongly since the original JQTI. This is resolved
in this commit.

(Note that QTIWorks still does not enforce timeLimits anywhere.)
Added missing timeLimits.allowLateSubmission attr

This is now supported in JQTI+. (Note that timeLimits is not supported at
a "higher" level in QTIWorks at present.)
WIP: Refactor of candidate services

This now uses the new authentication filter, and I've converted the
existing session token idea so that it works like an XSRF token.

Needs testing and tidying next.
Updated Maven plugin versions

A user noted that the 'shade' plugin version (2.0) is not working with
the latest version of Maven. So I've updated that plugin, and other
used plugins to bring them all to their current versions.
Merge branch 'master' into candidate_access_refactoring
Finished initial candidate refactor. Needs tested

The new candidate session management has been refactored and joined up
with the existing MVC and service layers.

I have tested with the demo & instruction functionality and this is
working correctly.

Still need to test with LTI, which I can't do until I'm back in the
office. (At home presently.)
Removed 'public' field from Assessment entity

This ended up never being used as I had originally planned, so is being
dropped as part of a final DB tidy.

NOTE: A schema change will be required. See the migration script:

support/schema-migrations/beta5-to-beta6.sql

(for PostgreSQL)
Removed the 'public' field from DeliverySettings

As with Assessment, this is no longer being used as originally planned.
Final tidy of DB column naming. Fixes issue #44

* Dropped the 'public' field from the Assessment and DeliverySettings
entities. This idea was never developed from my initial plans, and the
existing DB column names caused clashes.
* Renamed other DB column names to avoid those listed in the URL below,
which lists a superset of keywords reserved in various well-known DB
systems.

https://drupal.org/node/141051

Thanks to Kevin Curley for reporting this issue. These changes should
fix bug #44.

NOTE: Existing QTIWorks installations will have to perform a schema
migration for this. See the script
support/schema-migrations/beta5-to-beta6.sql, which will work for
PostgreSQL installations and can be used as a guide for other DBs. If
you have no real data you may want to wipe and reinstall the DB.
Merge branch 'master' into candidate_access_refactoring

Conflicts:
	qtiworks-engine/src/main/java/uk/ac/ed/ph/qtiworks/services/CandidateSessionStarter.java
	qtiworks-engine/support/schema-migrations/beta5-to-beta6.sql
Minor improvements to 'import users' engine action

* Simplified CSV column ordering
* Inline help info now describes the necessary CSV structure