Using the logo instead of the word MeV across the top in dataset view
Cleanup
Added index to value tables fixing #514, but removed caching from value
fetches altogether. Currently clustering performance is slightly worse
than cached in memory. Default cache size on the embedded H2 DB is 16MB,
increasing that would possibly increase performance. External caching is
a hack anyway.
Switched to shared value cache, performance on par with previous cached
implementation. Played around with H2 caching, however I was unable to
get performance results on a similar performance feel as the external
caching. Going to try compiled queries next.
Polish
Merge remote-tracking branch 'upstream/master'

Conflicts:
	web/src/main/javascript/edu/dfci/cccb/mev/web/javascript/main.js
Merge remote-tracking branch 'upstream/master'
Removed autocloseable from datasets because Spring was closing on return
from controller method, for now the tables are closed automatically on
db connection drop (created with TEMPORARY tag) which could be enough,
but regardless this problem will need to be addressed.

After trying different things, this configuration seems to yield the
best performance, jOOQ for query building, indexed tables, H2 db url
caching options didn't seem to produce any results, shared caching for
all datasets.
Merge pull request #531 from lev-kuznetsov/master

Polish DB value store, misc fixes