* remove the graph component output; add support for dependency on graph component
* fix bug; adjust unit tests
* add support for explicit dependency of graph component
* adjust unit test
* add a todo
* bug fixes for unit tests
* refactor condition_param code; fix bug when the inputs task name is None; need to remove the print later
* do not pass condition param as arguments to downstream ops, remove print logs; add unit tests
* add unit test golden yaml
* fix bug
* fix the sample
* add a While in the ops group
* deepcopy the while conditions when entering and exiting
* add while condition resolution in the compiler
* define graph component decorator
* remove while loop related codes
* fixes
* remove while loop related code
* fix bugs
* generate a unique ops group name and being able to retrieve by name
* resolve the opsgroups inputs and dependencies based on the pipelineparam in the condition
* add a recursive ops_groups
* fix bugs of the recursive opsgroup template name
* resolve the recursive template name and arguments
* add validity checks
* add more comments
* add usage comment in graph_component
* add a sample
* add unit test for the graph opsgraph
* refactor the opsgroup
* add unit test for the graph_component decorator
* exposing graph_component decorator
* add recursive compiler unit tests
* add the sample test
* fix the bug of opsgroup name
adjust the graph_component usage example
fix index bugs
use with statement in the graph_component instead of directly calling
the enter/exit functions
* add a todo to combine the graph_component and component decorators
* fix some merging bug
* fix typo
* add more comments in the sample
* update comments
Alexey Volkov
Ning