Merge pull request #8 from jthurst3/master

Proposals/Testing grammars/Tutorial pull request
Merge branch 'master' of https://github.com/piantado/LOTlib
LOTlibTest should now be added in
add __init__.py file to Proposals/ directory
move LOTlib/Testing folder to LOTlibTest/ folder
import statement was correct, now reads 'from LOTlib.Proposals.RegenerationProposal import RegenerationProposal'
start to test log_probability function with finite testing grammars
add log_probability() function to each testing grammar, that manually computes the log probability of a tree in the grammar
small fix in Proposals
Merge pull request #9 from jthurst3/master

LOTlibTest is the new testing folder
put testing grammars in LOTlibTest/Grammars/, and reference them from the testing files in LOTlibTest/
rename FiniteWithBVs to FiniteWithBVArgs