WebSubmit: file stamper option to copy metadata

* Introduces the "--skip-metadata" option to the file stamper.
  If enabled, the file stamper will not copy the PDF metadata from the input
  file to the (stamped) output file. Otherwise, the file stamper will attempt
  to copy all PDF metadata.  (closes #1569)

Signed-off-by: Nikolaos Kasioumis <nikolaos.kasioumis@cern.ch>
Acked-by: Tibor Simko <tibor.simko@cern.ch>
WebSession: Python-2.4 combatibility issue fix

* In Python-2.4 tuples don't have the index attribute. Converting a tuple to a
  list will provide that attribute.

Signed-off-by: Nikolaos Kasioumis <nikolaos.kasioumis@cern.ch>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
errorlib:  support for Sentry logging

* Optionally captures exceptions and sends them to the Sentry logging
  platform, if directed by the new CFG_ERRORLIB_SENTRY_URI configuration
  variable. (closes #1726)

* Adds raven python package to requirements-extra

Signed-off-by: Fredrik Nygård Carlsen <me@frecar.no>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
installation: README.rst with build status badges

* Adds new documentation file README.rst which is essentially
  identical to README, plus contains extra links to Travis build
  status badges, bringing them onto the GitHub home page.

  This is done because apparently GitHub only recognises file
  formats by extensions, so badges cannot be easily introduced
  into plain README files (that we still keep as per GNU autotools
  practices).

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
installation: GnuPG key server location update

* Updates location from where to get the GnuPG keys; the old
  location was not working anymore since quite a while.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
Merge branch 'maint-1.0' into maint-1.1

* maint-1.0:
  installation: GnuPG key server location update
  installation: README.rst with build status badges

* Merge note: amended README.rst badge to use maint-1.1.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
Merge branch 'maint-1.1'

* maint-1.1:
  installation: GnuPG key server location update
  installation: README.rst with build status badges
  WebSession: Python-2.4 combatibility issue fix
  WebSubmit: file stamper option to copy metadata

* Merge note: amended README.rst badge to use master,
  and removed Python-2.4 compatibiity fix that is not
  needed since master requires Python-2.6 at least.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>