Fix indentation.

This change fixes the following 10 errors I saw when running jscs.

```
Expected indentation of 8 characters at packages/loader/lib/main.js :
    59 |        else if (part === '.') { continue; }
    60 |        else { parentBase.push(part); }
    61 |      }
----------------^
    62 |
    63 |      return parentBase.join('/');

Expected indentation of 8 characters at packages/loader/lib/main.js :
    61 |      }
    62 |
    63 |      return parentBase.join('/');
----------------^
    64 |    }
    65 |

Expected indentation of 6 characters at packages/loader/lib/main.js :
    62 |
    63 |      return parentBase.join('/');
    64 |    }
--------------^
    65 |
    66 |    requirejs._eak_seen = registry;

Expected indentation of 6 characters at packages/loader/lib/main.js :
    64 |    }
    65 |
    66 |    requirejs._eak_seen = registry;
--------------^
    67 |
    68 |    Ember.__loader = {

Expected indentation of 6 characters at packages/loader/lib/main.js :
    66 |    requirejs._eak_seen = registry;
    67 |
    68 |    Ember.__loader = {
--------------^
    69 |      define: define,
    70 |      require: require,

Expected indentation of 4 characters at packages/loader/lib/main.js :
    71 |      registry: registry
    72 |    };
    73 |  } else {
------------^
    74 |    define = Ember.__loader.define;
    75 |    requirejs = require = requireModule = Ember.__loader.require;

Expected indentation of 6 characters at packages/loader/lib/main.js :
    72 |    };
    73 |  } else {
    74 |    define = Ember.__loader.define;
--------------^
    75 |    requirejs = require = requireModule = Ember.__loader.require;
    76 |  }

Expected indentation of 6 characters at packages/loader/lib/main.js :
    73 |  } else {
    74 |    define = Ember.__loader.define;
    75 |    requirejs = require = requireModule = Ember.__loader.require;
--------------^
    76 |  }
    77 |})();

Expected indentation of 4 characters at packages/loader/lib/main.js :
    74 |    define = Ember.__loader.define;
    75 |    requirejs = require = requireModule = Ember.__loader.require;
    76 |  }
------------^
    77 |})();
    78 |

Expected indentation of 2 characters at packages/loader/lib/main.js :
    75 |    requirejs = require = requireModule = Ember.__loader.require;
    76 |  }
    77 |})();
----------^
    78 |

```