CostFunction classes rewrite to use the new API (package broken)
Rewrite Matrix module (package still broken)
Add test for lapjv module
Solver classes rewrite

All tests pass now. I wait for you approbal before I merge it.
Add warning message to README and doc about sktracker being in very early stage development
Merge branch 'merge_cost_func_block' of github.com:hadim/scikit-tracker into merge_cost_func_block

Conflicts:
	README.md
	sktracker/tracker/solver/by_frame_solver.py
	sktracker/tracker/utils/tests/test_scores.py
passes the tests
separate cost computation for birth and death and a doctring fix
creates a `.mat` attribute for cost functions, `get_block()` should now be explicitly called
correct GapClose (passes the former comented test)
Fixed an undetected bug in matrix structure (birth and death were swaped, added a test to catch it next time
passed lik_percentile as a parameter
Fixed an a typo in brownian.gap_close that caused the distance matrix to be devided all the time
fixed test
Merge pull request #24 from bnoi/merge_cost_func_block

Redesign API: merge Block and CostFunction