Made some progress in fetching percentiles.

Still need to figure out how to sort the times and pick the offset.
Get approximate indexes for a given percentile.

It gets pretty close, in any case it is presently more accurate than an
average would be.
Update template and runs page for new data.
Add very basic test and fix offset error with getPercentileForUrl.
 - Adding instructions on adding a TTL
Merge branch 'percentile-fetch'

Graphs generated on the URL summary now use percentile values instead of
averages. This gives a more useful representation of performance when
large/small outliers are involved.

Closes #37, #28
Update README.md

Fix formatting in readme.
Add first pass at a composer.json file.

I'd like to start using Slim to make the code more managable, and since
xhgui will have more than one dependency it makes sense to use composer
for them.
Move files around and remove Twig.

Remove the inline Twig dependency as Xhgui will rely on composer in the
future. Move files around to where I think they might end up.
Add Twig view adapter for Slim.
Re-add config directory.

I'm a muppet and forgot to add it earlier.
Start porting code into a slim app.

Since slim doesn't have a built-in way to modularize an app start off
with very basic file includes to avoid the sprawling file of death.
Make url generation use slim's urlFor method.
Update links and add stub methods for other actions.
Add htaccess file.

Slim requires the use of rewrite rules, include a default file for
apache based hosts.
Move runs view into Slim.
Move url view into slim.
Move symbol view to slim.
Move callgraph action to slim
Move watch list + watch save over to Slim.