All db connection and creation logic is the same, it is just pulled into
a synchronized method so that multiple threads run through the
connection process one at a time.

Fixes #571

- define checkstyle configs in as few places as possible
- use checkstyle:check since it has defaults that match what we want (fail after logging to console)
- modules that have current failures set property checkstyle.failOnViolation to false.

* Rabased pull/489/head (@allanbank) to master
* Backed out unnecessary line breaks for 120 char limit
* Enforced checkstyle on new code
  * Was required to make db variable private, updated in tests
  * Removed TODO

Closes #489

Cleaner handling of properties.
Updated documentation of available properties.
Removed default database url.

Making progress towards #539

The version bump required some fixes because of changes to the OrientDB
API as well as to accomodate for changes in thread safety for testing.

Fixes #562

Replaces numeric status codes with a canonical set of Status objects,
each with a short name and description.
Bindings with more specific errors (e.g., timeouts) return additional
statuses.

This changes the default output from messages like:

   [UPDATE], Return=0, 511

To:

   [UPDATE], Return=OK, 511

As a part of branching to stage 0.2.0 release in #266, set version
for continued development on master branch.

* remove unused declared deps in a few places
* lex sort modules in top level pom
* update maven plugin versions.
* no more jar-with-dependencies
* set ycsb-core to provided in bindings
* introduce a bindings-parent pom that sets
** stage dependency copy on building binding
** iff binding has a README.md, build a binding-specific dist artifact
* update distribution assembly to
** properly build after modules
** use per-binding sets of dependencies

closes #250

* Need a SNAPSHOT version because non-SNAPSHOT is reserved for actual releases.
* Increment minor version per pre-1.0 guidelines from the Version Numbers guide

Fixes #236.