options() typo causing create_intermine_builder to fail

[heralden]

There's a small typo here where there should be square brackets instead of parentheses, causing a Dictionary error to be raised.

intermine_boot/intermine_boot/intermine_docker.py

Lines 231 to 234 in d1f55ff

	environment['IM_REPO_URL'] = (
	IM_REPO_URL if IM_REPO_URL != '' else options('im_repo'))
	environment['IM_REPO_BRANCH'] = (
	IM_REPO_BRANCH if IM_REPO_BRANCH != '' else options('im_branch'))

[22PoojaGaur]

added fix to #37