Feature/no hardcode

Hi, 

I Wanna make adding new platform easier by removing hard-code value and add them libraries.js

So it will looks like this:
```javascript
module.exports = {
    platforms:['cordova-android', 'cordova-blackberry','cordova-ios'],
    'cordova-android':{
        'git': 'https://git-wip-us.apache.org/repos/asf/cordova-android.git',
        'path': path.join(__dirname, 'lib', 'cordova-android'),
        'output': path.join(__dirname, 'temp', 'android')
    },
    'cordova-blackberry':{
        'git': 'https://git-wip-us.apache.org/repos/asf/cordova-blackberry.git',
        'path': path.join(__dirname, 'lib', 'cordova-blackberry'),
        'output': path.join(__dirname, 'temp', 'blackberry')
    },
    'cordova-ios':{
        'git': 'https://git-wip-us.apache.org/repos/asf/cordova-ios.git',
        'path': path.join(__dirname, 'lib', 'cordova-ios'),
        'output': path.join(__dirname, 'temp', 'ios')
    },
    'test':{
        'path': path.join(__dirname, 'lib', 'test'),
        'output': path.join(__dirname, 'temp', 'test')
    },
    first_tested_commit:{
        'cordova-android':'538e90f23aaeebe4cc08ad87d17d0ab2dde6185d',
        'cordova-ios':'6e60c222f8194bb43de6b52c5ea9ff84cc92e040'
    }
};
```

You need to update the couch db as well by prefixing all platform value with 'cordova-'
Ex:
```javascript
"views": {
       "cordova-android": {
           "map": "function(doc){if (doc.platform == 'cordova-android' && doc.mobilespec) {emit(doc.sha, {\"total\":doc.mobilespec.total,\"passed\":(doc.mobilespec.total - doc.mobilespec.failed),\"version\":doc.version,\"model\":doc.model,\"fails\":doc.mobilespec.failures});}}"
       },
       "cordova-blackberry": {
           "map": "function(doc){if (doc.platform == 'cordova-blackberry' && doc.mobilespec) {emit(doc.sha, {\"total\":doc.mobilespec.total,\"passed\":(doc.mobilespec.total - doc.mobilespec.failed),\"version\":doc.version,\"model\":doc.model,\"fails\":doc.mobilespec.failures});}}"
       },
       "cordova-ios": {
           "map": "function(doc){if (doc.platform == 'cordova-ios' && doc.mobilespec) {emit(doc.sha, {\"total\":doc.mobilespec.total,\"passed\":(doc.mobilespec.total - doc.mobilespec.failed),\"version\":doc.version,\"model\":doc.model,\"fails\":doc.mobilespec.failures});}}"
       }
```