ENH/BUG: Add predictor diagnostics; fixed intial_guess

Added a class decorator that adds instrumentation and diagnostics output
to any predictor class.

Corrected initial guess behavior in ChannelPredict, and the
corresponding (wrongly) passing test.
Made numba subnet linker use global max size; fixed typos
Prediction velocity fields spanning multiple frames.
CLN: Backslash line continuations in predict.py

Rely on parentheses instead.
Merge pull request #109 from nkeim/predict_diagnostics

ENH/BUG: Prediction diagnostics and bugfixes
CLN/PERF: Do not import matplotlib at the module level.
Merge pull request #112 from danielballan/no-mpl-import

CLN/PERF: Do not import matplotlib at the module level.
CLN: On first run of FFTW, print info statement instead of ugly warning. Also fix typo.
Merge pull request #115 from danielballan/fftw-message

CLN: Change info on first run of FFTW.
FIX: Fix typo introducing in #112 mpl cleanup.
Merge pull request #117 from danielballan/fix-mpl-typo

FIX: Fix typo introducing in #112 mpl cleanup.
ENH: annotate features in multiple colors

Conflicts:
	trackpy/plots.py

removed white spaces

Conflicts:
	trackpy/plots.py

finished implementing the ability to section particles into different colors in annotate plot

cleanups
Merge pull request #104 from RebeccaWPerry/master

annotate with two different colors based on threshold
CLN: Remove stray debugging print statement.
Merge pull request #119 from danielballan/remove-stray-print

CLN: Remove stray debugging print statement.
FIX/ENH: Allow locate to invert float images by assuming normalization=1.
Merge pull request #118 from danielballan/allow-invert-float-images

FIX/ENH: Allow locate to invert float images (assume normalization)
RLS: Version 0.2.1
Merge pull request #120 from danielballan/rls-0.2.1

RLS: Version 0.2.1
DOC/BLD: Fix setup.py for ReadTheDocs.