Rename python and java bazel rules.

Use && for internal_copied_filegroup.

So that the rule fails if one or more files cannot be copied.

Python bazel support

We need to use the list to indicate field presense.
The field must only contain 0 or 1 string element.

fix json_format for python2.6:

1, objcect_pair_hook is not supported in python2.6, so duplicated key check is removed in 2.6
2, total_seconds is not suppoted in python2.6, changed to compute seconds directly

Allow include to be None.

This enables the use case where all the paths are relative to the
workspace root, e.g.

foo/bar/BUILD
       /foo.proto -- package foo.bar

would generate the message correctly.

Fix typos in cmake README.md

In anticipation of PR #753 getting merged we'll change this back. However until that PR gets merged the old value "BUILD_TESTS" is really needed.

Improved CMake project

Extract protoc action into .bzl for cc.

This is needed to support python bazel build.

Expose GetOutputFile in csharp_names.h

Changed return type from int32 to bool in function returning a bool

Add support for arguments.

Changed argument typ to uint32 in set function that sets an uint32 value

Support curl -s argument.
Signed-off-by: Matthew Valimaki <matthew.valimaki@gmail.com>