Change travis gradle task, small doc update (#295)

* Use gradle task build in travis

* Update CONTRIBUTING.md

.github/CONTRIBUTING.md

@@ -1,19 +1,20 @@
 # Bugs
 * Include version (Setting > About > Version)
  * If not latest, try updating, it may have already been solved
- * Debug version is equal to the number of commits as seen in the main page
+ * Dev version is equal to the number of commits as seen in the main page
 * Include steps to reproduce (if not obvious from description)
 * Include screenshot (if needed)
 * If it could be device-dependent, try reproducing on another device (if possible), include results and device names, OS, modifications (root, Xposed)
 * **Before reporting a new issue, take a look at the [FAQ](https://github.com/inorichi/tachiyomi/wiki/FAQ), the [changelog](https://github.com/inorichi/tachiyomi/releases) and the already opened [issues](https://github.com/inorichi/tachiyomi/issues).**
 * For large logs use http://pastebin.com/ (or similar)
-* For multipart issues use list like this:
+* For multipart issues **use list** like this:
  * [x] Done
  * [ ] Not done
 ```
 * [x] Done
 * [ ] Not done
 ```
+* Don't put together too many unrelated requests into one issue
 
 DO: https://github.com/inorichi/tachiyomi/issues/24 https://github.com/inorichi/tachiyomi/issues/71
 

.travis.yml

@@ -15,7 +15,7 @@ android:
 before_script:
     - chmod +x gradlew
 #Build, and run tests
-script: "./gradlew clean assembleDebug testDebugUnitTest"
+script: "./gradlew clean build"
 sudo: false
 
 before_cache: