Merge pull request #94 from quite/add-component-relatedto

Add ComponentPropertyRelatedTo; the VTODO component can have that

Merge pull request #91 from brenank/master

Unescape Value-Type: TEXT in Golang Model

Merge pull request #90 from zachmann/master

Re-add Calendar.RemoveEvent method

Merge pull request #88 from meain/org-mailto

Prefix mailto: for email in organizer property

Merge pull request #87 from JM-Lemmi/fix/text_escaping

Revert incorrect text escaping patch.

Merge pull request #86 from JM-Lemmi/fix/text_escaping

Fix various text escaping issues

Merge pull request #83 from bcspragu/last-modified

Add {Get,Set}LastModifiedAt helpers

Merge pull request #82 from quite/add-component-priority

Add ComponentPropertyPriority; the VTODO component can have that