Built-in chaining of arbitraries

Features

• (PR#103) Use the output of arbitraries to produce other ones with .chain(...)
• (PR#114) Add shrink for fc.lorem
• (PR#116) Throw exception in case of bad path when trying to replay a failure

Fixes:

• (PR#117) Doc: Fully revamp the documentation
• (a5dcd71c) Doc: New logo