bcc release v0.11.0

the main changes from v0.10.0 to v0.11.0 tag:
  * Support for kernel up to 5.3
  * Corresponding libbpf submodule release is v0.0.5
  * Fix USDT issue with multi-threaded applications
  * Fixed the early return behavior of lookup_or_init
  * Support for nic hardware offload
  * Fixed and Enabled Travis CI
  * A lot of tools change with added new options, etc.

Initial tag

Merge pull request #29 from iovisor/bblanco_dev

Add simple single file example