Store values in rwconfig.xml as their correct types

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Everything is stored as a string in rwconfig. Only strings should be strings. Ints should be ints, etc.

<string name="rw_spec_server_url">http://example.com/roundware/</string>
<string name="rw_spec_project_id">1</string>
<string name="rw_spec_heartbeat_interval_in_sec">30</string>

rwconfig.xml:

roundware-android/rwservice/src/main/res/values/rwconfig.xml

Line 9 in 7e3930d

<string name="rw_spec_heartbeat_interval_in_sec">30</string>

val = context.getString(R.string.rw_spec_heartbeat_interval_in_sec);
mHeartbeatTimerSec = Integer.valueOf(val);

RWConfiguration.java:

roundware-android/rwservice/src/main/java/org/roundware/service/RWConfiguration.java

Line 156 in 7e3930d

mHeartbeatTimerSec = Integer.valueOf(val);

Here is the list of other valid data types: https://developer.android.com/guide/topics/resources/more-resources.html