Split file checks into seperate job

.travis.yml

@@ -2,6 +2,9 @@
 language: generic
 sudo: false
 
+git:
+  depth: 1
+
 env:
   global:
     - BYOND_MAJOR="509"
@@ -22,17 +25,23 @@ addons:
       - libgcc1:i386
       - libstdc++6:i386
 
-install:
-  - pip install --user PyYaml -q
-  - pip install --user beautifulsoup4 -q
-
 before_script:
   - chmod +x ./install-byond.sh
   - ./install-byond.sh
 script:
-  - shopt -s globstar
-  - (! grep 'step_[xy]' _maps/map_files/**/*.dmm)
-  - md5sum -c - <<< "6dc1b6bf583f3bd4176b6df494caa5f1 *html/changelogs/example.yml"
-  - python tools/ss13_genchangelog.py html/changelog.html html/changelogs
   - source $HOME/BYOND-${BYOND_MAJOR}.${BYOND_MINOR}/byond/bin/byondsetup
   - bash dm.sh -M${DM_MAPFILE} paradise.dme
+
+matrix:
+  include:
+    - env: FILE_CHECKS=1
+      addons:
+      install:
+        - pip install --user PyYaml -q
+        - pip install --user beautifulsoup4 -q
+      before_script:
+      script:
+        - shopt -s globstar
+        - (! grep 'step_[xy]' _maps/map_files/**/*.dmm)
+        - md5sum -c - <<< "6dc1b6bf583f3bd4176b6df494caa5f1 *html/changelogs/example.yml"
+        - python tools/ss13_genchangelog.py html/changelog.html html/changelogs