v0.1.0 release

• [hot-fix-43] change the job status api (#44, @merlintang)
• Add readme (#42, @jian-he)
• GetDefaultContainerPortNumber to GetDefaultContainerPortName (#41, @merlintang)
• re-org api package (#39, @jian-he)
• Remove the podControl and serviceControl interfaces (#36, @jian-he)
• refine arguments of ControllerInterface.UpdateJobStatus (#35, @sperlingxx)
• Generate vendor directories (#28, @terrytangyuan)
• Add skeleton code for reconcile service (#25, @merlintang)
• Correct function names in the comment (#32, @terrytangyuan)
• Make UpdateJobConditions public to be used by custom operators (#30, @jian-he)
• Unify the label keys (#29, @jian-he)
• Add utility methods for job reconciliation (#24, @terrytangyuan)
• test: Add util/train/train_util_test.go (#26, @gaocegege)
• chore: Fix package name (#27, @gaocegege)
• Add utility methods for pod creation (#17, @terrytangyuan)
• Remove mentions of tensorflow in test job (#21, @terrytangyuan)
• Fix incorrect name for restart policy exit code (#20, @terrytangyuan)
• Update go.sum changed by golangci-lint (#18, @terrytangyuan)
• Added .gitignore file (#16, @terrytangyuan)
• Add more utility functions for job and status (#14, @jian-he)
• Added missing generated lines in go.sum (#15, @terrytangyuan)
• Added schedulingPolicy api. (#13, @k82cn)
• Define interfaces for common job operators (#12, @jian-he)
• Add Travis badge and Go report card (#9, @terrytangyuan)
• Enable Travis CI on kubeflow/common (#6, @richardsliu)
• Common job controller library (#5, @richardsliu)
• Add terrytangyuan to OWNERS (#4, @richardsliu)
• Add common types to kubeflow/common (#2, @richardsliu)
• Create LICENSE (#1, @richardsliu)