Feature/tweak testing

[KristofferC]

• Enables testing with coverage=true to output the .cov.jl files that Coverage uses to send to Coveralls.
• Moves the Lint to the test/REQUIRE file since it isn't strictly needed to run the package.

[coveralls]

Coverage increased (+44.36%) to 44.36% when pulling 0da38b4 on KristofferC:feature/tweak_testing into fb88e73 on JuliaGeometry:master.

[KristofferC]

Lint seem to fail to initialize in v0.4 causing the test for v0.4 to fail.

Warning: error initializing module Lint:
Base.AssertionError(msg="typeof(ex.args[3]) == Symbol")
ERROR: LoadError: LoadError: LoadError: LoadError: UndefVarError: RTLD_GLOBAL not defined

Don't really know why...

[sjkelly]

This was probably caused by the LibC and LibDL move (JuliaLang/julia#10328)

One alternative I have used is wrap using Lint; lingpkg(); in if "--lint" in ARGS so that lint is only run with runtests.jl --lint. I kind of find the lint output annoying after a while and less informative.

Otherwise these changes look good to me! I think you can self-merge, so feel free to do so when you are ready.

[KristofferC]

Yeah, maybe there isn't a big point in automatic linting at test unless failing to lint cleanly is considered a test failure.

Should I rebase the branch to squash the commits to a single one?

[sjkelly]

rebase and squash might be nice but not nessecary. I was realizing how much I polluted the git history on this repo by working directly on master a couple days ago...

[sjkelly]

I am alos seeing the same failure on JuliaGeometry/Meshes.jl#39. I think the best thing to do here is put lint behind a CLI option and not bother running it on travis.