Fix cosmetic problems in YAML source

This change corrects problems reported by the `yamllint` linter.

Since key duplication problems were removed in 4d48711, this commit
mainly fixes trailing spaces and extra empty lines at beginning/end of
files.

test/integration/targets/gem/meta/main.yml

@@ -1,3 +1,2 @@
-dependencies: 
+dependencies:
   - prepare_tests
-

test/integration/targets/gem/tasks/main.yml

@@ -23,18 +23,17 @@
   shell: gem list | egrep '^gist '
   register: uninstall
   failed_when: "uninstall.rc != 1"
- 
+
 - name: install a gem
   gem: name=gist state=present
   register: gem_result
 
 - name: verify module output properties
-  assert: 
-    that: 
+  assert:
+    that:
         - "'name' in gem_result"
-        - "'changed' in gem_result" 
-        - "'state' in gem_result" 
+        - "'changed' in gem_result"
+        - "'state' in gem_result"
 
 - name: verify gist is installed
-  shell: gem list | egrep '^gist ' 
-     
+  shell: gem list | egrep '^gist '