Upadate CrashReportDataFactory class

https://github.com/ACRA/acra/wiki/AdvancedUsage#adding-your-own-custom-variables-or-traces-in-crash-reports-breadcrumbs

I have replaced HashMap to LinkedHashMap in order to keep breadcrumbs in order in which I added to the map.
Merge pull request #158 from zrafal86/patch-1

Make custom data ordered.