feat(SublimeText2.GitPackages): cache packages

EthanBrown.SublimeText2.GitPackages/tools/PackageCache/Git/CONTRIBUTORS

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+These are the people who helped make this plugin:
+
+David Lynch <kemayo@gmail.com>
+Sheldon Els <sheldon.els@gmail.com>
+Nick Fisher <spadgos@gmail.com>
+Can Yilmaz <can@potatolondon.com>
+Stefan Buhrmester <buhrmi@gmail.com>
+Rafal Chlodnicki <rchlodnicki@opera.com>
+Daniël de Kok <me@danieldk.eu>
+David Baumgold <david@davidbaumgold.com>
+Iuri de Silvio <iurisilvio@gmail.com>
+joshuacc <josh@designpepper.com>
+misfo <tedwardo2@gmail.com>
+Kevin Smith <kevin@ilovecode.de>
+Κώστας Καραχάλιος <kostas.karachalios@me.com>
+Dominique Wahli <dominique.wahli@solvaxis.com>
+Fraser Graham <frasergraham@me.com>
+Hamid Nazari <hamidnazari@ymail.com>
+Jeff Sandberg <paradox460@gmail.com>
+Joshua Clanton <joshua.clanton@gmail.com>
+Maxim Sukharev <max@smacker.ru>
+Niklas Hambüchen <mail@nh2.me>
+Patrik Ring <me@patrikring.se>
+Scott Bowers <sbbowers@gmail.com>
+Weslly Honorato <weslly.honorato@gmail.com>
+brcooley <brcooley@cs.wm.edu>
+jdc0589 <jdc0589@gmail.com>
+Adam Venturella <aventurella@gmail.com>