Assign weakself to a strong pointer to fix #475
Make unit optional in CSS length values
Merge pull request #476 from percysnoodle/develop

Assign weakself to a strong pointer to fix #475
Merge pull request #477 from percysnoodle/font_size_fix

Make unit optional in CSS length values
Merge branch 'develop' of github.com:Cocoanetics/DTCoreText into develop
Merge branch 'develop'