MODE-2252 Fixed the paging mechanism for writable connectors which attempt to add more children than the size of the current page.

Conflicts:
	modeshape-jcr/src/main/java/org/modeshape/jcr/spi/federation/Pageable.java
	modeshape-jcr/src/test/java/org/modeshape/connector/filesystem/FileSystemConnectorTest.java
Merge pull request #1173 from hchiorean/MODE-2252

MODE-2252 Fixed the paging mechanism for writable connectors which attempt to add more children than the size of the current page.