Convert bytes to string before JSON encoding during ToJson. Switch to 2 servers. Add profiling info for loader.

Have a flag to forbit mutations on a server. Very useful for the live demo, or other read-only situations.

Changing type of value from interface to []byte

Making sure tests pass.

Addressing todo and fixing tests in query_test.go

Removing parseValue function.

Enable vendoring using GOVENDOR

Benchmarking

Resolves - https://discuss.dgraph.io/t/vendoring-dependencies-for-dgraph/177

Pertaining to the discussion mentioned above: GLOCKFILE has been removed,
README has been updated, and vendor/vendor.json has been added. At this
point of time we are only adding dependency information file(vendor.json) and
not the actual dependencies. This commit also helps avoiding
installation of dependencies in $GOPATH if vendor directory is synced
using govendor.

1. Changing extension of files with binary data to .bin.
2. Running separate benchmark for each query according to numElements in their
result.

1. Exporting query and result byte slices inside SubGraph so that they are
written to file when we write the SubGraph to file after gobencoding it.
2. Added benchmark test to benchmark ToJSON and ToProtocolBuffer methods for
actors and directors query for 10,100 and 1000 entities in the result.

Output the offending line in error log if rdf.Parse fails.

Grpcerror

Functionality to find first N results