Adding TTL argument to the relevant specs
iOScookbook documentation on SQLite store
rename section to PropertyList Storage Specific
Merge branch 'AGIOS-75'
Update to something more realistic due to time and efforts
Postpone asymmetric encryption, message authentication and 
digital signatures
update tutorial with callback syntax
update tutorial with callback syntax
Reapplying matzew changes
mention 'ttl' option on the sender tutorial
fixed typo
Removal of ridiculous tasks into the roadmap
Adding updates on API changes for multiple categories (sending and device registration)
fix variable name and ident in iOS cookbook
Merge remote-tracking branch 'ckrych/ckrych/fix.typo.ios.cookbook'
reflect 'categories' API change
be more specific when more than one param is accepted
Refer to latest otp demo