Drush integration

As a follow up to #786990: Get rid of the usage of eval() I've made a drush command to run the import of a big set of terms (~8000 items in a hierarchy of three levels) from command line.

It's just the minimum drush code to allow running a import. The import is done with code from install_profile_api. It's just a start that solves my problem. A better integration is possible :)

Trace:

$ drush --debug te-import profiles/prop/fixtures/taxonomy_regiones.export 
Drush bootstrap phase : _drush_bootstrap_drupal_root() [0.22 sec, 3.78 MB]                                         [bootstrap]
Drush bootstrap phase : _drush_bootstrap_drupal_site() [0.29 sec, 4.5 MB]                                          [bootstrap]
Drush bootstrap phase : _drush_bootstrap_drupal_configuration() [0.33 sec, 4.5 MB]                                 [bootstrap]
Drush bootstrap phase : _drush_bootstrap_drupal_database() [0.38 sec, 4.5 MB]                                      [bootstrap]
Successfully connected to the Drupal database. [0.38 sec, 4.5 MB]                                                  [bootstrap]
Drush bootstrap phase : _drush_bootstrap_drupal_full() [0.43 sec, 4.79 MB]                                         [bootstrap]
Drush bootstrap phase : _drush_bootstrap_drupal_login() [0.76 sec, 17.38 MB]                                       [bootstrap]
Found command: taxonomy-export-import (commandfile=taxonomy_export) [0.81 sec, 17.37 MB]                           [bootstrap]
Vocabulary 'Regiones' imported successfully. [1065.58 sec, 44.16 MB]                                                  [status]
8189 terms imported successfully. [1065.58 sec, 44.16 MB]                                                             [status]
Command dispatch complete [1065.58 sec, 44.14 MB]                                                                     [notice]
 Timer  Cum (sec)  Count  Avg (msec) 
 page   1065.249   1      1065248.97 
Peak memory usage was 60.26 MB [1065.59 sec, 44.14 MB]                                                                [memory]

A better integration is possible :)