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PCA support is added. This means that support is now available for
showing both PCA and CA next to each other. When filtering is applied,
both PCA and CA are updated, but on the variables that were used to
initialise them. To achieve this, the DimRedPlot service is now
responsible for performing PCA and CA, such that it also knows which
analyses have been performed. The effect of this change is also that
some of the logic from plotctrl has been moved into the DimRedPlot
service, which is good since controllers shouldn't have too much logic
anyways.

The reason for the problem was that minifying removes value-less tags.
Such tags are however used by ui-bootstrap to create dropdown menus.
Fixed by giving the tags a problem.

The label says: "x+y contribution"

In the clustering menu, an switch has been added with which this
behaviour can be switched. Closes #6.

Currently data is not standardised before k-means is applied. This can
have adverse effects when the variables clustered on do not have the
same scale. Standardisation should fix this.

The CSTR database had the following value in variable M36 at position
248: 1,006.10. Apparantly R does not support this notation and converted
   the M36 variable to a factor variable. I looked at the values of the
248th contig, and it really seems to be that the value is 1006.10 so I
fixed this an turned M36 into a numeric variable. As far as I can tell,
this particular instance is the only case where a value gets higher than
1000.

We have now all the files to prepare the wrighton dataset, as well as the
script to perform the preparation and to start the application.

This should users give a good deal of information to prepare their own
datasets.

This makes it a bit more clear to the user where we are in the preparation
process. It takes a bit of time, so giving an update every now and then
gives at least a hint of progress being made.

It's unlikely that we'll use fasta anytime soon in the tool. So, let's just
remove these comments for now.

We'll only provide the processed files for cstr.