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
Merge pull request #2625 from fabriziofortino/develop

avg function: small refactoring to improve code reuse and fix possible
Minor: let OJSONReader accepts Reader
removed code not used anymore from binary serialization.
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
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