When composer is run it can cache vendor packages in ~/.cache

If you define requirements to pull from dev-master the items are not cachable. Currently all zeta components are not cachable and slow down the process.

<code>
Composer successfully installed to: /var/www/sites/5.2/ezpublish_legacy/composer.phar
Use it: php composer.phar
[9.1MB/0.04s] Loading composer repositories with package information
[23.5MB/5.99s] Installing dependencies (including require-dev)
[43.2MB/6.48s] - Installing ezsystems/ezpublish-legacy-installer (v2.0.0)
[43.2MB/6.48s] Loading from cache
[43.2MB/6.50s]
[43.3MB/6.51s] - Installing zetacomponents/base (1.8)
[43.3MB/6.51s] Loading from cache
[43.3MB/6.53s]
[43.3MB/6.54s] - Installing zetacomponents/archive (dev-master d0caff8)
[43.3MB/6.54s] Cloning d0caff8e162ecb755efa30f23b7a3f63c114cdf9
[43.4MB/31.52s]
[43.4MB/31.55s] - Installing zetacomponents/authentication (dev-master c422670)
[43.4MB/31.57s] Cloning c422670d09967491c1c8c98f9334f1a738617bd0
[43.5MB/46.64s]
[43.5MB/46.66s] - Installing zetacomponents/authentication-database-tiein (dev-master 56d1e0a)
[43.5MB/46.67s] Cloning 56d1e0a754265834df2e1667b5ee2b0c9de93b12
[43.5MB/60.68s]
[43.5MB/60.69s] - Installing zetacomponents/cache (dev-master 34fa794)
[43.5MB/60.71s] Cloning 34fa794d0b5aeef67fee609c52c5d24fa4604bbd
[43.6MB/92.50s]
[43.6MB/92.52s] - Installing zetacomponents/configuration (dev-master 10ae09f)
[43.6MB/92.53s] Cloning 10ae09f42768d4657b2d1a66226ee63cbd8754b2
</code>