Removed release builds.
Merge pull request #75 from luca-heltai/travis_mixed_compilation

Removed release builds from the Travis tests.
Silence a warning

A logical construct of the form "EXPR && EXPR || EXPR" in manifold_lib.cc
triggered a bunch of warning. Silence them by explicitly enclosing the
intended precedence: (EXPR && EXPR) || EXPR.

Also run reindent on the file.
Merge pull request #78 from tamiko/silence_warning

Silence a warning and reindent.