getBuildVersion() calls fixed; safeGetFile() fn introduced

_posts/gradle-revisited.md

@@ -23,9 +23,14 @@ Previously `gradle.properties` contained sensitive info (passwords, duh), so it
String safeGet(String name, String defaultValue = '') {
  hasProperty(name) ? project[name] : defaultValue
}
// returns file from a path provided in properties file
File safeGetFile(String name) {
    String fileName = safeGet(name, null)
    fileName != null ? file(fileName) : null
}
```

And replacing all `project.VARIABLE` occurunces with `safeGet('VARIABLE')`.
And replacing all `project.VARIABLE` occurunces with `safeGet('VARIABLE')`. Use `safeGetFile('VARIABLE')` to get files.

**NOTE:** Variable name is **quoted** in a function call.

@@ -222,7 +227,7 @@ defaultConfig {
  applicationId "com.yourPackage.someMore"
  minSdkVersion 15 // because #minSDK15
  targetSdkVersion 22
  versionCode getBuildVersion(defaultValue: 1)
  versionCode getBuildVersion(1)
  versionName "0.0.1"
}
```
@@ -234,7 +239,7 @@ String fileName = [
  defaultConfig.applicationId,
  project.name,
  defaultConfig.versionName,
  getBuildVersion(increment: true)
  getBuildVersion(android.defaultConfig.versionCode, true)
].join('-')
```