Develop 0.2.0 snapshot
Merge pull request #17 from siscia/master

Little change for protocols.
Merge remote-tracking branch 'origin/master' into develop
Rework setters to use new protocol names
Fix immutable setting for sequences
Docstring updates, immutable mset
Immutable setting for persistent vectors
Compliance tests for mutable setting, fix slicewrapper
More tests
mset! improvements
mset! docs
docs
add current-implementation-check function
docs
Make ScalarWrapper mutable
NDWrapper mutability fixes
Delete redundant view objects (now in NDWrapper)
Wrapper improvements
NDArray implementation fill-out
core.matrix title in README