Fixed name of the latest MoM.
Graph - ObjectNode from null fix
fix #27 - graph depth = 0
Concurrency check added in Document Table

When you try to change document that just has been changed by someone
else, it throws a
[StaleObjectStateException](http://docs.jboss.org/hibernate/orm/4.3/javadocs/org/hibernate/StaleObjectStateException.html).
See the
[test](https://github.com/PreXident/TextAn/blob/master/Data/src/test/java/cz/cuni/mff/ufal/textan/data/test/ConcurrencyTest.java).
I thing that's enough for adding/updating documents co it fixes #19
You need to recreate database as described in #28
Added latest MoM
Merge remote-tracking branch 'remotes/origin/master' into db-hibernate2

Conflicts:
	Data/src/test/java/cz/cuni/mff/ufal/textan/data/test/ConcurrencyTest.java
repaired file name
Merge branch 'server-impl'
Merge commit '36235171241931055c42765c5f69b0f97ba20d66'
Added latest MoM
Merge remote-tracking branch 'remotes/origin/master' into db-hibernate2
Test upgrade

Se to zase sere cely
fixed #32

Precision of dates is now in seconds
I hope this fixes #33

RelationOccurrence.anchor was nullable before because it's a string or
where is the problem?
Added InRelationTableDAO.
RelationOccurrence.position nullable
Not tested too much but should work
Merge remote-tracking branch 'remotes/origin/db-hibernate2' into server-impl
Fixed SaveService