Merge branch 'New3' of https://github.com/ayende/ravendb into R1369
Merge branch 'RavenDB-1369' of https://github.com/ayende/ravendb into TestBranch-1369
issue fixed: RavenDB-2163
used NProgress prgress bar and spinner to "inform" user about loading (when loading time is between 1sec and 10 sec)
used error message to inform user that waiting time is too long (when reaching 10 sec mark)
Repro tests for issues RavenDB-2330 and RavenDB-2331
RavenDB-2245 Add additional RavenDB metrics
- first version of reset counter
- don't replicate counter if only creating it with value=0
fix for counting the correct number of groups
fix for resetting unsaved or deleted counters
ported RavenDB-2334 fix from 2.5
restored forcing of Voron storage engine
Merge branch 'master' of https://github.com/ayende/ravendb
fixed replication when resetting counter
Merge branch 'master' of https://github.com/grisha-kotler/ravendb
- Fixed: http://issues.hibernatingrhinos.com/issue/RavenDB-2330
- Fixed: http://issues.hibernatingrhinos.com/issue/RavenDB-2331
- Fixed: RavenDB-2339
* Server side: Couldn't find any reference to caching on the download code-path.
* Browser side: I have forced through CacheControl the following behaviors: No-Cache, No-Store, Must-Revalidate and a MaxAge of zero.
- Converted to async another test.
Multiple tabs works with Studio again

Initial work on shared /changes API connections across tabs. Not
finished, but at least gets us to multiple tabs working again.
another fix for reset when the sum of negatives is bigger than the sum of positives
Merge branch 'master' of https://github.com/ayende/ravendb
RavenDB-2245 Add additional RavenDB metrics
RavenDB-2325 Transformer can return null values