refactoring dependency configuration, extract variables for jersey, jackson and logback version
added H2 inmemory database
Merge branch 'db'

Conflicts:
	src/main/java/org/docear/syncdaemon/fileindex/FileIndexServiceImpl.java
Merge branch 'db'

Conflicts:
	src/main/java/org/docear/syncdaemon/fileindex/FileIndexServiceImpl.java