Update code to be compatible with asciidoctor 1.5.0
Update example build instructions for asciidoctor 1.5.0
Bump version number
Merge branch 'master' into asciidoctor-1.5
Bump version number
Merge bugfixes from master
Merge pull request #28 from pepijnve/asciidoctor-1.5

Bugfixes for asciidoctor-diagram 1.2.x
Merge branch 'master' into asciidoctor-1.5
Bump version number
Merge 1.1.4 bugfixes
Merge branch 'master' into asciidoctor-1.5

Conflicts:
	CHANGELOG.adoc
	lib/asciidoctor-diagram/version.rb
Merge branch 'master' into asciidoctor-1.5
Bump required asciidoctor version to latest preview release
Make shaape extension loading code asciidoctor 1.5 compatible
Make shaape extension class constructor asciidoctor 1.5 compatible
Merge branch 'master' into asciidoctor-1.5
Change version number to 1.2.0
Change asciidoctor dependency to 1.5.0 final
diagram.rb cleanup