REF/STY: Standardize variable names. Pep-8. Docs cleanup
ENH: Import ArmaProcess and arma_generate_sample to api.
REF: Remove unused estimation class.
STY/REF: Pep-8. Fix broken variable names. Remove imports.
REF: Don't need to set attributes of super class
REF: Update for size -> nsample consistency rename.
DOC: Reverse poly coef example
Update contrast.py

Fixes two minor docstring typos.
Merge pull request #2042 from tshauck/patch-1

DOC: Fix two typos
ENH: Allow unit interval for binary models. Closes #2040.
MAINT: Update mailmap.
Merge pull request #1426 from jseabold/arma-process-cleanup

ENH: Import arima_process stuff into tsa.api
Merge pull request #2044 from jseabold/discrete-unit-interval

ENH: Allow unit interval for binary models. Closes #2040.
SQUASHME: Update release notes.
MAINT: Workaround for existing OAuth not in keyring.
MAINT: Deal with unicode.
MAINT: Update release notes with gh-stats
DOC: Use idiomatic statsmodels.
DOC: Updates to release notes.
Merge pull request #2045 from jseabold/whatsnew-0.6

DOC: Release notes for 0.6.