PEP-8 rewrite except for public function names.

Show diff for variant protein from non-reference start codon

The alternative variant protein sequence translated from a
non-reference start codon (created by the variant), was not
color-diffed as normal variant protein sequences are.

In the process we also rename the `oldprotein` and `newprotein`
fields in the output object to `oldProtein` and `newProtein` to
be more consistent with other field names.

Translate alternative start to M, also in variant

In the case of an alternative start codon (in the reference CDS),
protein changes were not visualised. This is fixed and a WALTSTART
warning is also issued.

Also, if a new non-reference start codon is created by the variant,
visualise this as such.

In case of an alternative start codon, the variant CDS was not
translated to a protein starting with M. This caused the protein
description machinery to conclude a variant affecting the start
codon, hence reporting `p.?`.

We fix this by always translating the start codon to M (except
when the variant actually affects it).

Example: `NM_024426.4:c.1107A>G` (a synomymous mutation) should
yield `NM_024426.4(WT1_i001):p.(=)`, not `p.?`. The start codon
for that protein is `CTG`.

Disable Travis-CI notifications on Slack

We see the Travis-CI status in GitHub pull requests anyway.

Add Baker's yeast (SacCer_Apr2011/sacCer3) assembly

Using the Werkzeug reloader is configurable

The Werkzeug reloader is disabled by default due to a bug with
using it in combination with `python -m mutalyzer.entrypoints.website`.

https://github.com/mitsuhiko/werkzeug/issues/461#issuecomment-139369694

Fix service location in SOAP WSDL document

By default, the first request to the SOAP service will trigger a
build of the WSDL document, using the context (service location)
from that request. For example, if the first request is on
`http://localhost/` and subsequent requests are on
`https://mutalyzer.nl/services/`, they will not have a valid WSDL
document.

This is actually what we do on our production infrastructure,
where the service is tested (on localhost) after it has been
started.

The fix is to force a build of the WSDL document and specifying
the location to use.

http://spyne.io/docs/2.10/reference/server.html#spyne.server.wsgi.WsgiApplication

Only create database tables once

If at least our assemblies table exists, we assume the Alembic
migrations will deal with the rest.

Documentation updates

Unit tests with PostgreSQL and MySQL

Release 2.0.11

Fix bug in recognizing p.(=)

Release 2.0.10

Fix transcript mappings containing no exons

For transcripts without any UTR and CDS entries in the NCBI Mapview
file (seems to happen for  predicted genes), we generate one exon
spanning the entire transcript.

Fix typo in docs