A useful script to manually trigger builds on arbitrary projects / branches as a workaround:
#!/bin/bash -e
# Usage:
#
# 1. set $CIRCLE_API_TOKEN
# 2. run `./trigger-build <account> <oroject> [<branch>]`
#
# For https://github.com/iambob/myfirstproject:
#
# trigger_build iambob myfirstproject
#
# ... will build master
_account=$1 # e.g. github user name or organization name
_project=$2 # e.g. my_repo_name
_branch=${3:-"master"} #optional, defaults to master.
_circle_token=${CIRCLE_API_TOKEN}
echo "Triggering build of $_project ($_branch)."
trigger_build_url="https://circleci.com/api/v1.1/project/github/${_account}/${_project}/build?circle-token=${_circle_token}"
post_data="{ \"branch\": \"${_branch}\"}"
curl -s \
--header "Accept: application/json" \
--header "Content-Type: application/json" \
--data "${post_data}" \
-request POST "${trigger_build_url}"