test: Streamline test suite a little

This change aims to streamline the integrationtest suite and reduce friction when running (parts of) test suites.

Changes:
- add `test-testname` to makefile to easily run one suite
- made skipping tests first class citizen in test.sh (all available testsuites and the reasons they are skipped are now better exposed and discovered)
- suppress some output of gotest unless there is an error
- no longer build binary for examples and gotest suites
- removed .SILENT from makefile as it being applied to only some targets makes it feel weird (I just learned about this option btw, feel free to comment on this change)
- move individual tests out of `test.sh` and into `test-misc.sh`
- introduced the concept of testsuites to `test.sh`

test/test-gometalinter.sh

@@ -2,7 +2,7 @@
 # check a bunch of linters with the gometalinter
 # TODO: run this from the test-golint.sh file instead to check for deltas
 
-echo running test-gometalinter.sh
+echo running "$0"
 
 #ROOT="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"	# dir!
 ROOT=$(dirname "${BASH_SOURCE}")/..
@@ -62,6 +62,7 @@ if [[ -n "$failures" ]]; then
 	echo 'FAIL'
 	echo 'The following tests have failed:'
 	echo -e "$failures"
+	echo
 	exit 1
 fi
 echo 'PASS'