Added check if assertions are on
added vector assertion and code formatting
Fixed difference in implementations between benchmarks
Started implementation for stronger invariant

code implemented for append
still has bug on unbalanced vectors
fixed bug
Changed Platform.arraycopy to System.arraycopy
Extended the stronger invariant to the sizes array
Switched on rrbvector xunbalanced benchmarks
Implemented prepend using dirty states. Fixed bugs with append.
Added threshold ++ and ++= where append is used instead of concat
Set default benchmarks
Removed threshold from ++
Added benchmarks for the least unbalanced vectors
Printing random seed as part of the test name
Implemented dropFront0 method. Implemented drop and takeRight with it.
Added 'drop' benchmarks
Removed unused method
Added vector builder specifications to the tests
Fixed bug
Fixed bug (iterator was not throwing the exception on 'next' when it reached the end)