Issue #3050 was fixed.
Fixed bugs found by FindBugs tool
Merge branch 'develop' of https://github.com/orientechnologies/orientdb into develop

Merged changes
Added support for token based authentication supported via a plugin mechanism.

Conflicts:
	core/src/main/java/com/orientechnologies/orient/core/db/ODatabase.java
	core/src/main/java/com/orientechnologies/orient/core/db/raw/ODatabaseRaw.java
	core/src/main/java/com/orientechnologies/orient/core/db/record/ODatabaseRecordAbstract.java
	core/src/main/java/com/orientechnologies/orient/core/metadata/security/OSecurityNull.java
	core/src/main/java/com/orientechnologies/orient/core/metadata/security/OSecurityProxy.java
	core/src/main/java/com/orientechnologies/orient/core/metadata/security/OSecurityShared.java
	object/src/main/java/com/orientechnologies/orient/object/db/OObjectDatabaseTx.java
	server/src/main/java/com/orientechnologies/orient/server/OServer.java
	server/src/main/java/com/orientechnologies/orient/server/network/protocol/http/OHttpRequest.java
	server/src/main/java/com/orientechnologies/orient/server/network/protocol/http/OHttpUtils.java
	server/src/main/java/com/orientechnologies/orient/server/network/protocol/http/ONetworkProtocolHttpAbstract.java
	server/src/main/java/com/orientechnologies/orient/server/network/protocol/http/command/OServerCommandAuthenticatedDbAbstract.java
Added support for token based authentication supported via a plugin mechanism.
updated to the last version of the user managment, fixed some java8 dependency
reformated jwt source code with the orient formatter
replaced base64 encoder for jwt with orient base64 encoder for avoid duplicate code.
renaming following the orient naming convention.