Fix/english particle verbs to dev

[JakobSteixner]

Correct results for pattern.en.lemma/pattern.en.conjugate/pattern.en.tenses with particle verbs by splitting the input into verb stem and sattelites (first word and everything else) before doing the base class _Verb processing.

example:

>>> import pattern.en as enp
>>> print(enp.conjugate("dispose of", list(enp.tenses("discarded"))[0])) # old result was: 'dispose offed'
'disposed of'

[coveralls]

Coverage decreased (-0.1%) to 68.392% when pulling 9a51869 on JakobSteixner:fix/english-particle-verbs-to-dev into 17f2154 on clips:development.