Merge pull request #1 from esa/master

Getting the latest PyKEP
gtoc7 asteroid added
New constructor overloaded for planet: r,v can be used now
Minor docs improvments and small glitch in lambert solved
quick barker equation implemented
Merge branch 'master' of https://github.com/darioizzo/pykep
get_state added to the low-thrust leg and ic2par exposed
bug fix on get_states()
Bug Fix Neptune Uranus ephs
Neptune-Uranus eph fixed
Small docs change
Merge pull request #9 from darioizzo/master

Barker Equation, sims_flanagan get states, ic2par exposition