Fixing Etag/Guid conversion

(Closes #1470)
Fix a bug when reporting where the values would not update correctly from index
Merge branch 'master' of https://github.com/fitzchak/ravendb
Merge branch 'unstable' of https://github.com/e-tobi/ravendb
Will abort an attempt to get performance counter data if it take too long
Will detect corrupted perf counters and avoid using them for the next db load
RavenDB-1472 --> in certain scenario, terms query ("In" operator) retrieves incorrect results
added another test --> related to issue 1472
Making sure that Jint recognize Array(0) as a valid way to create empty array
Fixing tests
Making sure we aren't trying to delete same document twice
RavenDB-1471. Transformers with Authorization bundle
Merge pull request #480 from ppekrol/RavenDB-1471

RavenDB-1471. Transformers with Authorization bundle
Fix a failing test, load with transformer which transform a document to an array of documents, should return null if the document does not exist, rather then return an empty array. We should return an empty array once when the transformer function return empty results.