Commits on Jan 8, 2018

1. pex_binary: Support PEXes with no entry points (interpreters) …

   When using pex without any entry points, it creates a PEX that is an
   interpreter that uses the bundled environment. This can be useful to
   distribute in order to execute other scripts.
   
   interpreter_only_test.py: Verify that the PEX starts an interpreter.
   
   Fixes the following Skylark exceptions in pex_binary:
   
   File ".../bazel_rules_pex/examples/BUILD", line 24
     pex_binary(name = 'interpreter_only')
   File ".../bazel_rules_pex/pex/pex_rules.bzl", line 177, in _pex_binary_impl
     pex_file_types.filter(ctx.files.srcs)[0]
   index out of range (index is 0, but sequence has 0 elements)
   
   File ".../bazel_rules_pex/examples/BUILD", line 24
     pex_binary(name = 'interpreter_only')
   File ".../bazel_rules_pex/pex/pex_rules.bzl", line 225, in _pex_binary_impl
     main_pkg
   name 'main_pkg' is not defined

   Evan Jones committed Jan 8, 2018
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