Add datetime, date, time, and timestamp field types

Fixes #64
Update to account for binary format changes
Merge pull request #66 from dwins/datetime-date-time-timestamp

Add datetime, date, time, and timestamp field types
Add support for encoding date/time attributes in TextSerializationFactory.

Also fixes a bug in DataStreamValueSerializer that was calling ValueSerializer.write
with the Optional<Object> instance instead of the Object itself, and in
TextValueSerializer that was calling toString() on Optional.get() instead
of Optional.orNull().
fix some findbugs reproted problems, especially possible null pointer dereferences to BufferedReader.readLine()
fixed problem with apply command using object database instead of staging database
Added quickstart and reorganized docs folder to remove redundant files
Replaced MergeTools command by Conflcit command and added test
Fixed checkout message when working tree is not clean, suggesting using --force option
Merge pull request #69 from volaya/conflicts_command

Replaced MergeTools command by Conflicts command and added test
Merge pull request #68 from volaya/apply_fix

fixed problem with apply command using object database instead of stagin...
Fix functional test failure introduced at b9156bef7
Fixes documentation typos
Extended import capabilities with additional options
Initial commit of jenkins nightly build script
Removed ambiguity in option names in import commands.

Added --alter and --add options to Spatialite import command and added a couple of functional test
Updates to Readme

A bit more description, some more status, links to docs and more on helping out.
Merge pull request #77 from cholmes/master

Updates to the readme
Merge pull request #76 from volaya/import

Extended import capabilities with additional options
documentation update