Pre flight (#64)

* Pre-flight - verify input files before running main script.

* Pre-flight - verify input files before running main script.

.travis.yml

@@ -1,4 +1,7 @@
 language: python
+before_install:
+  - pip install commentjson
+  - python verify_files.py
 install:
   - pip install -r requirements.txt
 script: bash ./deploy.sh

verify_files.py

@@ -0,0 +1,29 @@
+import commentjson
+import sys
+
+try:
+    with open('set_info') as data_file:
+        setinfos = commentjson.load(data_file)
+except Exception as ex:
+    print "Unable to load file: set_info\nException information:\n" + str(ex.args)
+    sys.exit("Unable to load file: set_info")
+try:
+    with open('cards_manual') as data_file:
+        manual_sets = commentjson.load(data_file)
+except Exception as ex:
+    print "Unable to load file: cards_manual\nException information:\n" + str(ex.args)
+    sys.exit("Unable to load file: cards_manual")
+try:
+    with open('cards_corrections') as data_file:
+        card_corrections = commentjson.load(data_file)
+except Exception as ex:
+    print "Unable to load file: cards_corrections\nException information:\n" + str(ex.args)
+    sys.exit("Unable to load file: cards_corrections")
+try:
+    with open('cards_delete') as data_file:
+        delete_cards = commentjson.load(data_file)
+except Exception as ex:
+    print "Unable to load file: cards_delete\nException information:\n" + str(ex.args)
+    sys.exit("Unable to load file: cards_delete")
+
+print "Pre-flight: All input files loaded successfully."