Unify parameter and prior classes

WIP: Unify Parameter and Prior class into one class

https://git.ligo.org/Monash/peyote/issues/33

added 2 commits

• 1f7e12bf - Moritz Huebner: Got rid of value property in parameter class
• b9efc6ca - Moritz Huebner: Made the import safe

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The reason I introduced the noise log likelihood as a property rather than a function is that it really shouldn't change unless you change the data/interferometers. And if you do that, you should really make a new likelihood object.

Having it being evaluated every time also means that if you want to use it to "normalise" the likelihood on the fly it can save computation time. It really is just a number.

added 2 commits

• 61174749 - remove old reference to prior
• 847cb829 - update 150914 to use new prior interface

Compare with previous version

merged

mentioned in commit 86963e57