ENH: Add ability to specify initial guess for predictors.
ENH: Added predictor for mean drift of all particles
DOC: Updated prediction example notebook to mention initial values.
Merge pull request #91 from nkeim/add-predict-guess

Add drift predictor and prediction initial guess
Remove examples, and leave a README directing users to the trackpy-examples repo.
Merge pull request #92 from danielballan/remove-examples

Remove examples, and leave a README directing users to the trackpy-examples repo.
DOC: Direct README links to notebooks in trackpy-examples
Merge pull request #93 from danielballan/remove-examples

DOC: Direct README links to notebooks in trackpy-examples