Improvements (#243)

* Remove unused imports/docs

* Suppressed IDEA warnings

* Test Document's toString

* Test closing document stream

* Test detaching Document stream

* Test getting size of stream

* Test getting stream byte position

* Test Document stream eof

* Test Document stream seek

* Test Document stream rewinding

* Test Document stream is not writable

* Test Document stream is writable by checking file open mode

* Test Document stream writes successfully

* Test Document stream is readable

* Test Document stream getMetaData

* Test Document stream reads successfully

* Inline multi-conditional for better code coverage

* Make all LiveProperty functions protected visibility