Merge pull request #4215 from juliantaylor/where-obj-fix

BUG: fix reference count, thread safety and dtypes of np.where
Merge pull request #4232 from juliantaylor/check-win-compile

TST: fail on declaration-after-statement in travis test
MAINT: update scipy-sphinx-theme

Adds copybutton that toggles ">>>" in code samples.
Merge pull request #4233 from pv/copybutton

MAINT: update scipy-sphinx-theme
WIP: add encoding option to numpy text IO

add encoding flag to np.loadtxt to be able to load non default encoded
text files.