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