check for paused earlier
optimize paused remove({}) which oplog uses
clean up minimongo 'query' object

delete unused fields, rename underscored fields
minimongo: Make update-by-id O(1)
optionify LocalCollection._getRawObjects
add a test for observeChanges/limit/initial
Fix _.each patch on IE.

The patch was originally introuduced in
bab936eac99004b6cd14b4ed8b279862e2d7e606
Merge branch 'devel' into shark