Update BIP32: 'hardened' terminology + explicit conversions
added link to Objective-C implementation of BIP32
Fix Typos

proceeds -> precedes
seperate -> separate
Merge pull request #17 from trezor/master

BIP39 changes
Merge pull request #19 from fanquake/patch-1

Fix typos in BIP 14
Merge pull request #15 from oleganza/master

added link to Objective-C implementation of BIP32
Added bip32utils Python implementation reference
Merge pull request #16 from jmcorgan/add-bip32utils-ref

Added bip32utils Python implementation reference
Clarify UTC for all time values in BIP70.
Merge pull request #20 from schildbach/bip70-add-utc

Clarify UTC for all time values in BIP70.
BIP62 number assignment for Non-malleable txn
Make reference to the redeemScript terminology
Document 520-byte serialized script limit
Fix typo: PaymentRequest is hashed rather than the Payment message.
Merge pull request #25 from schildbach/bip70-typo-certificates

Fix typo: PaymentRequest is hashed rather than the Payment message.
BIP 21: Add a missing "&" rule to the ABNF grammar

The URI syntax uses an ampersand to separate query parameters,
but the ABNF grammar didn't reflect this fact.

Also, the type of grammar used here is "ABNF" and not "BNF".
BIP 21: Mention RFC 3986 and character set
BIP 21: Precisely define the valid query characters
BIP 72: Reduce the amount of escaping needed

RFC 3986 obsoletes RFC 1738, which this BIP was wrongly referencing.
The new RFC requires far less escaping for query parameters.
Documenting the timestamp for BIP-0030

Per the linked commit, this rule became active for blocks with timestamps after on March 15, 2012 at 00:00 UTC (February 20, 2012 at 00:00 UTC for testnet).