Added a new method ErrorReporter#addOnExceptionHandledCommand

Use this method to add commands to be executed before the ErrorReporter
handles the throwable. This can be used to put custom data.
New report field: 'STACK_TRACE_HASH'.
This field contains a hash of the reported stacktrace, facilitating grouping of similar crashes.
As discussed here: https://groups.google.com/forum/#!searchin/acra-discuss/bod/acra-discuss/DajoZbpO-4w/Fvd1LVx_09sJ
Added support for defining a custom keystore
Corrected white space
Introduced manual non-annotation based init methods and associated configuration builder.
Apply ACRAConfiguration in init
Merge pull request #150 from npombourcq/master

Close the InputStream in LogFileCollector
Use ACTION_SENDTO in email Intent
Don't use EXTRA_EMAIL
Add ability to clear out customParameters
Add crashReportDataFactory.clearCustomData support
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.
Solves issue with SendWorker failing because it cannot start a Thread when constructing a connection pool. This solution is to do away with the connection pool. Since we are only ever using the ConnectionManager with a single thread (which is then discarded) there is no problem with multi threaded interference.
Merge pull request #98 from johncarl81/manualinit

Introduced manual non-annotation based init methods.
Merge pull request #132 from moutsosgeorgios/master

Support for specifying a custom keystore
Merge pull request #154 from jclehner/fix-email-intent

Use ACTION_SENDTO in EmailIntentSender
Merge pull request #155 from InsanityOnABun/master

Add ability to clear out customParameters
Merge pull request #158 from zrafal86/patch-1

Make custom data ordered.
Merge pull request #165 from william-ferguson-au/issue-136

Solves issue-136 - SendWorker failing because it cannot start a Thread on App destruction
Missing import.
Replacing use of unitialised attribute with method param.