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.

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

Grpcerror

Functionality to find first N results

Added helper functions for Graph response to client

preTraverse()

Removed the unnecessary extract function and result struct. Now preTraverse
directly acceses flatbuffers to get values and uidmatrix.
Renamed struct fields in the protocol buffer schema file.

1. Removed client.go and client_test.go
2. Modified protocol buffer structure to have Values as a struct which
contains byte slice.
3. Added support to calculate latency because of protocol buffer.

Set 1 min timeout on query processing

1. Protocol buffer now stores a entity based subgraph instead of a predicate
based subgraph.

HasValue and Value now look for value iteratively instead of storing it in a
map.

Removed Populate() method for entity. Now Properties() and Children() are
created during iteration.

links in README now point to discourse

Parsing and modifying the subgraph returned in the response. Provided helper
methods for the response.

Query would be needed to parse the Graph Response on the client side, hence
sending it in the protocol buffer response.