Add support for building from facebookincubator repos

Summary: Currently, fbcode_builder assumes you're building code living in the facebook github org. If you try to do travis builds using a facebookincubator repo, an error occurs due to hard-coded assumptions about the org. This fixes that

Reviewed By: knekritz

Differential Revision: D9183307

fbshipit-source-id: 0a1ac399953485e84f0534cc0616765227088c80

build/fbcode_builder/fbcode_builder.py

@@ -372,14 +372,14 @@ class FBCodeBuilder(object):
             self.cmake_configure(name, cmake_path) + self.make_and_install()
         )
 
-    def fb_github_autoconf_install(self, project_and_path):
+    def fb_github_autoconf_install(self, project_and_path, github_org='facebook'):
         return [
-            self.fb_github_project_workdir(project_and_path),
+            self.fb_github_project_workdir(project_and_path, github_org),
             self.autoconf_install(project_and_path),
         ]
 
-    def fb_github_cmake_install(self, project_and_path, cmake_path='..'):
+    def fb_github_cmake_install(self, project_and_path, cmake_path='..', github_org='facebook'):
         return [
-            self.fb_github_project_workdir(project_and_path),
+            self.fb_github_project_workdir(project_and_path, github_org),
             self.cmake_install(project_and_path, cmake_path),
         ]