Release 0.1.2-beta: Additions to FilteredLineIterator, functional and docs

ADDED:
- StealthBlockEntity.getCopyWithParentAssigned
- SingleLineEntity getCopyWithParentAssigned
- BlockEntity getCopyWithParentAssigned
- FilteredLineIterator:
- *AllBlockLines*: Convenience function for retrieving all lines in a
newly active block.
- Functions for returning non-raw entities: getRootBlock(),
getActiveChild(), getActiveChildBlock(), getActiveChildStealthBlock(),
getActiveChildSingleLine()
CHANGED:
- FilteredIterator:
- Functions for returning raw entities (required to allow the new
non-"raw" functions in FilteredLineIterator): getRawRootBlock(),
getRawActiveChild(), getRawActiveChildBlock(),
getRawActiveChildStealthBlock(), getRawActiveChildSingleLine()
DOCS:
- Added examples to FilteredIterator tutorial