fixed bug #2608
Releasing OrientDB Community Edition 1.7.7
fix NPE on sbtree clear.
Merge branch '1.7.7' of github.com:orientechnologies/orientdb into 1.7.7
Merge branch '1.7.7' of https://github.com/orientechnologies/orientdb into 1.7.7
Update history with 1.7.7
Switched to OrientDB Community 1.7.8-SNAPSHOT
Distributed: fixed issue #2576 about readQuorum
Distributed: node is online after it completes the pending queue of startup.
Distributed: fixed problem on startup
Fixed issue #2610
Fixed issue #2614
Fixed bug on Studio for empty in/out edges
Minor: let OJSONReader accepts Reader
Fixed minor issues related to ETL usage
Issue when removed file attempted to be restored with error was fixed.
Merge branch '1.7.8' into develop

Conflicts:
	build.xml
	client/pom.xml
	commons/pom.xml
	core/pom.xml
	core/src/main/java/com/orientechnologies/orient/core/OConstants.java
	core/src/main/java/com/orientechnologies/orient/core/storage/impl/local/paginated/OLocalPaginatedStorage.java
	distributed/pom.xml
	distribution/pom.xml
	enterprise/pom.xml
	graphdb/pom.xml
	nativeos/pom.xml
	object/pom.xml
	pom.xml
	server/pom.xml
	server/src/main/java/com/orientechnologies/orient/server/schedule/OScheduleHandler.java
	tests/pom.xml
	tools/pom.xml