fix #19
Merge pull request #20 from Crystalnix/fix-package-size

fix #19
add 'crash' app
add Vagrantfile
add Symbols model & admin
get debug meta info from .sym file task & unittest
added s3fs
Improvements SymbolsAdminForm
fix eb nginx client_max_body_size
improvements symbols_upload_to
added get_stacktrace & unittest
task processing_crash_dump & unittest
improvements tasks.processing_crash_dump
add stacktrace_to_json & unittest
fix #17
add field crash.stacktrace_json