Added URL checker and corresponding CI job. Removed travis related files. Fixed dead URLs.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>
5 jobs for master in 20 minutes and 41 seconds
Status Job ID Name Coverage
  Test
failed #52760
test_gms_preprocessing

00:08:27

63.0%
passed #52762
test_gms_preprocessing_install

00:10:56

passed #52763
test_styles

00:00:22

passed #52761
test_urls

00:00:54

 
  Deploy
skipped #52764
pages
 
Name Stage Failure
failed
test_gms_preprocessing Test
make: *** [Makefile:80: nosetests] Error 1
Uploading artifacts for failed job
Uploading artifacts...
htmlcov/: found 48 matching files and directories

WARNING: docs/_build/html/: no matching files
nosetests.html: found 1 matching files and directories

nosetests.xml: found 1 matching files and directories

Uploading artifacts as "archive" to coordinator... ok
id=52760 responseStatus=201 Created token=8osKwYnb
ERROR: Job failed: exit code 1