retrofit org.restlet version to match geoserver's 2.4.x
Remove duplication of code between geogit-geoserver and web-app

All web commands were moved to web-api to be used by noth web-app
and geogit-geoserver, each of which provide an implementation of
the new RepositoryProvider interface for web commands to get the
geogit instance to work with.
geogit-geoserver uses a RepositoryProvider that grabs geogit instances
from geogit datastores in the geoserver catalog.
web-app uses a simple RepositoryProvider for the single geogit
instance its serving.
ignore OSM ways with less that 3 nodes when mapping to a polygon
minor fix in osm mapping documentation
Force cli command help to be printed to the cli console's output stream, which may be redirected
Fix missing commits bug in the default graph database.

Makes TinkerGraphDatabase.Impl implement BlueprintsGraphDatabase.commit()
so that the graph is saved to disk on each update. Otherwise all the
changes were only in memory until TinkerGraphDatabase.close() was
properly called, which frequently leads to missing entries in the graph
database.

A test case was added to TinkerGraphDatabaseTest, and the abstract
test suites for graph databases were improved so that they don't require
a full repository to be run.
changed how py4j connector returns output of geogit commands.

It seems that, for large strings, it is not working and it freezes. This commit implements a different approach, in which strings are obtained in smaller fixed-size chunks
Removed dependency of geotools progress listeners
Add Mongo-Blueprints implementation
Remove dependency on external blongo library
Merge pull request #627 from groldan/remove_code_duplication_in_web

Remove code duplication in geogit-web-app/geogit-geoserver
Merge pull request #631 from volaya/py4joutput

changed how py4j connector returns output of geogit commands.
Merge pull request #633 from volaya/progress_listener

Removed dependency of geotools progress listeners
fix compile error on wrong import package and add missing (c) header
Use guava instead of custom iterable and iterator decorators in mongo storage.

Replace AdaptingIterable/Iterator and ConcatenatedIterable/Iterator
by their corresponding guava facilities as used in the rest of the code
Move MongoGraph to package org.geogit.storage.mongo

There's no need for MongoGraph to be on its own package 'blongo'. Better
to favor package cohesion and lower coupling.
Merge branch 'osm_fixes' of github.com:volaya/GeoGit into volaya-osm_fixes
remove redundant else clause
Fix bug introduced at b4cf9011ff for osm import-history

Commit b4cf9011ff06cf94b1fb2531ca3f8feb0d2efdf8 replaced
 listener.setCanceled(false);listener.progress(0f);
by
 listener.cancel();listener.setProgress(0f);
In OsmHistoryImport.commit(...) which made the commit
op for each changeset think the operation was cancelled
and hence no commit was performed at all.
Merge pull request #630 from groldan/graphdb_persistence

Fix missing commits bug in the default graph database.