added support 'data' elements
Merge pull request #22 from Crystalnix/feature-data-element

added support for 'data' elements
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
add field Crash.signature
migrate stacktrace json to sentry.interfaces.Stacktrace
rename field crash.mini_dump to crash.upload_file_minidump
fix http status on upload crash dump