update changelog, readme
v1.5.0
add event-based vault creation system and interface for plugins to register their own AccountHolder types

sneak in attaching [vault] signs to chests directly
update changelog accordingly.
TownyAccountHolder friendly toString
v1.6.0-wip1
v1.5.1

* fixes vaults getting destroyed
* bypass vault sign embolding if it would mess up the character limit
* some super-minor code cosmetics
Merge branch 'v1.5.x'

Conflicts:
	changelog.md
	plugin.yml
	pom.xml
	src/main/java/org/gestern/gringotts/AccountListener.java
ensure the vault destruction bug in 1.5.0 doesn't return
version 1.5.1a - fix vault not passing requests for non-player events properly
Merge branch 'v1.5.x' - fixes to vault connector

Conflicts:
	changelog.md
	plugin.yml
	pom.xml
Fix container detection; sign text

- Containers probably won't ever be below themselves. (Minecraft 1.6:
The Quantum Update?)
- event.getType() returns "player" for normal vaults, pushing line
length over 15 char; reverted to cause.getline(0)
Merge pull request #54 from bezeek/upstream

Fix container detection; sign text
Fix NPE originating in FactionAccountHolder

Help id.startsWith("faction-") realize its truthiness.
(Todo: Convert/clean up old Factions DB records.)
Sketchy chest location for attached signs

Locate chests with attached signs; and fail if no valid containers are
found. Could use a good refactoring.
Merge pull request #55 from bezeek/upstream

Fix NPE originating in FactionAccountHolder; fix attached signs
add getting account holder by raw id
Merge branch 'master' of github.com:MinecraftWars/Gringotts
Revert "Fix NPE originating in FactionAccountHolder"

This reverts commit 82576dc58b6f83519bdceaedd649c3e8e7685c48.
fix/doc basic constructor
refactor: unduplicate chest checking methods