Merge pull request lemire#29 from imback82/imback82/move_operators

Move constructor / assignment operator

Adding "empty" function.

unset was wrong.

version 0.6.0

Tweaking sizeInBits

Merge branch 'master' of github.com:lemire/EWAHBoolArray

Adding support for logical operators (overloading) plus a potential o…

…verflow fix.

Fixing logicalxorcount

Fixed logicalandnot

Implemented logicalorcount and logicalandcount