Added some file-level comments to Node source files

Add nuget pkg version badge for C#

Bazel like output

Fix for long-running tsan test

Travis for iOS

Split tests into one scheme per test case

Prevent XCode 7 from showing spurious warnings

Device builds require code signing, that isn’t set up (they probably
wouldn’t work anyway - I don’t think Travis is attaching devices to
their VMs).

For local running one can still tests AllTests, but for C.I. one can
test the 4 of them in parallel (and, importantly, deactivate the remote
interop tests until we fix them on Travis; while keeping the rest).

I had to make the remote tests a subclass of an abstract InteropTests
(like InteropTestsLocalSSL and InteropTestsLocalCleartext), and then
deactivate the abstract InteropTests on the 4 schemes that use it.

Eventually all samples will be tested.

Add OpenCover coverage for C#

Fixing 'all' run tests target.

This will hopefully make xctool work on Travis too (cross fingers!)

Disabling qps openloop's test.

remove log spam

PHP: ran php-cs-fixer to comply with php coding standard