Release notes for 0.90.1

Move 0.90 release notes into 'doc' directory, fix relative links
Fix a couple of typos in 0.90.1 release notes
Fix broken relative link in old 0.08 release notes
Fix broken link in 0.90.1 release notes
Upgrade to new servald, fix ServalD encapsulation

Servald command line "set did" is now "keyring set did" with same output
format as "keyring add"

All servald keyring PIN arguments are now passed as optional
--entry-pin=<pin> arguments

Encapsulate all servald command lines into ServalD class, make
ServalD.command() methods protected so that command-line details remain
local to ServalD.java

Rename Identity.sid to Identity.subscriberId
Merge branch 'master' into 'development'
Log any exceptions and return null
Don't crash if servald returns a null name
Fix bugs invoking ServalD "rhizome list"

Upgrade to latest development servald

Do not pass null arguments -- these now cause NullPointerException --
pass empty strings instead

Do not pass empty strings for 'offset' and 'limit' arguments, simply omit them
or pass "0"

Refactor to make all ServalD.command() methods completely private
update rhizome add file syntax  when building apk+manifest
remove condition that checked tie to APK version (needs to be
revisited in future).
Fix case of audio monitor message
Import readable messages from the meshms log
Sync serval-dna
Update sensor-logger documentation based on expected paths.
Change default uploaded apk filename
Use new rhizome export manifest command
Sync serval-dna
Merge branch 'development' into mdpsock

Conflicts:
	jni/serval-dna
sid has been renamed subscriberId