CB-6481 adds plugin level hooks support

[sgrebnov]

1.Support of js script files only (nodejs is used to run script file)

2.Support of the following hook types

• beforeinstall/preinstall – run before plugin is installed
• install/postinstall/afterinstall – run after plugin is installed

• uninstall – run after plugin is uninstalled

  <script type="postinstall" src="scripts/postinstall.js" />
  <script type="preinstall" src="scripts/preinstall.js" />
  <script type="install" src="scripts/install.js" />

3.Use context argument to retrieve execution parameters inside hook function

module.exports = function(context) {
    console.log('hook.js>> platform: ' + context.platform);
    console.log('hook.js>> projectDir: ' + context.projectDir);
    console.log('hook.js>> pluginDir: ' + context.pluginDir);
    console.log('hook.js>> cmdLine: ' + context.cmdLine);

    var deferral = new Q.defer();

    setTimeout(function(){
        deferral.resolve();
    }, 1000);

    return deferral.promise;
}

[sgrebnov]

Created issue CB-6481 to cover this work. Switched to nodejs module loader. Sample hook file implementation with async functionality:

var Q = require('./q');

module.exports = function(context) {
    console.log('hook.js>> platform: ' + context.platform);
    console.log('hook.js>> projectDir: ' + context.projectDir);
    console.log('hook.js>> pluginDir: ' + context.pluginDir);
    console.log('hook.js>> cmdLine: ' + context.cmdLine);

    var deferral = new Q.defer();

    setTimeout(function(){
        deferral.resolve();
    }, 1000);

    return deferral.promise;
}

[sgrebnov]

Switched to single parameter called context

[sgrebnov]

@agrieve, thx for review; updated the code. Also did rebase

[ligaz]

Adding a couple of unit tests will be great :cop:

[sgrebnov]

Totally agree, will do as soon as cordova-lib work is stabilized so I can move the code to appropriate repo and perform final tests. @ligaz, thx for review.

[sgrebnov]

Moved to appropriate repo, closing... https://github.com/apache/cordova-lib/pull/12