First ready to use version

Main features:

• creation of a documentation
• more arbitraries: option, float, double, boolean
• fc.sample and fc.statitistics

Commits log:
f86fd17 Update README.md
e75f89e Update README.md
0707181 Update README.md
bb38c3e Add option arbitrary
a7eb45c Add some tests on Stream join
a7019b2 Add some tests on Stream join
fd323bb Add boolean type arbitrary
9a3e94a Check shrink of float and double
c8bf365 Add floating point number types: float, double
a67504b Format fc.assert/fc.property in Sampler.spec.ts
e149df8 Add fc.statistics to monitor arbitraries
380e70c Fix Sampler tests not run
51d04b5 Add unit test to check run can be reproduced
dba24f6 Ease the instantiation of stubs for arbitraries
aed0e1f Move instantiation of MutableRandomGenerator into stub
f2da21a Bump the dependencies
7c7a914 Split into two test suites: test (in test/unit) and e2e (in test/e2e)
e90022d Do not count fc.* for coverage (except e2e)
e7bb7e5 Move stubs into test/stubs
c88c962 Increase allowed execution time for travis
063a332 Add a sampler in order to diagnose arbitrary issues
453482c Move Parameters and runners' helpers to utils
b884478 Rework IProperty definition
1c1a0d0 Merge branch 'master' of https://github.com/dubzzz/fast-check
2ae99b2 Update README.md
d5b9e0e Update README.md
36fad8d Update README.md
ae19c9d Update README.md
b130048 Update README.md
5d36c50 Update README.md
f3490f7 Update README.md
5202eb7 Update README.md