api null and type checking

client fixes
Merge branch 'hotfix_plus_new_api' into dev

Conflicts:
	sdk/src/java/com/ifountain/opsgenie/client/OpsGenieClientConstants.java
Merge branch 'hotfix_plus_new_api' into dev
Merge branch 'hotfix_plus_new_api' into dev
Merge branch 'hotfix_plus_new_api' into dev
Merge branch 'hotfix_plus_new_api' into dev
Merge branch 'hotfix_plus_new_api' into dev
marid chain proxy support