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travis-ci

feat: Faster Cursors (#118)

The immutable/contrib/cursor implementation has been refined so that each cursor holds a pointer to the current data object in addition to root and keyPath. This makes getIn and especially get lookups 10x faster than before. As render methods usually are quite heavy in get calls, this should improve rendering significantly.

BREAKING CHANGE
The new cursor intentonally disallows storing cursors inside cursor
to warn against difficuilt to track situations that can lead to infinite loops.
Consequently the intenal redux store now keeps a vanilla immutable
structure as `state` rather than a cursor. This shouldn't cause
trouble except in redux middleware where the state is accessed
directly.

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