TEMPORARY changes to Travis to run the 'units' branch of RMG-database

Following the instructions at
https://github.com/ReactionMechanismGenerator/RMG-Py/wiki/Simultaneous-Update-of-RMG-Py-and-RMG-database

This commit should be removed before merging to master.

.travis.yml

@@ -35,7 +35,7 @@ jobs:
     - stage: test
       install:
         # Clone RMG-database
-        - git clone https://github.com/ReactionMechanismGenerator/RMG-database.git
+        - git clone -b units https://github.com/ReactionMechanismGenerator/RMG-database.git
         - cd RMG-Py
         - conda env create -q -f environment_linux.yml
         - source activate rmg_env

deploy.sh

@@ -48,7 +48,8 @@ git checkout $RMGTESTSBRANCH
 
 # create an empty commit with the SHA-ID of the 
 # tested commit of the RMG-Py branch:
-git commit --allow-empty -m rmgpy-$REV
+DB_DEPLOY_BRANCH="units"
+git commit --allow-empty -m rmgpydb-$REV-${DB_DEPLOY_BRANCH}
 
 # push to the branch to the RMG/RMG-tests repo:
 git push -f $REPO $RMGTESTSBRANCH > /dev/null