Merge pull request #1 from sk-y/master

String concatenation is available
Added Either utility class
Added factory methods to PropertyAccess
Added Property interface
Added parse-time property description
Added PropertyNode interface - parse-time property invocation
Property invocations are now represented via PropertyNode
Moved GetProperty to upper level
Removed unneeded functions for PropertyAccess creation
Added property resolver to grammar config
Moved Property interface to upper package
ReactiveSee now creates See instance by itself
Restored support for custom property resovers
Added value processors to grammar config
ReactiveSee now uses value processors from grammar config
[maven-release-plugin] prepare release v2.3.2
[maven-release-plugin] prepare for next development iteration
Added alternative value extraction via Either to PropertyAccess
Removed unused PropertyAccess.Value
Fixed docs for MakeSignal