Little improvements in input’s size documentation.
Merge pull request #871 from Wylkon/reboot

Little improvements in input’s size documentation.
Changing the name of forms classes

We think the name that we put in forms elements was very confusing. The
label was called .ls-field and the text of label was called ls-field.
Now, we chage this to this:
label - ls-label
text of label - ls-label-text
input/field - ls-field
fieldset or another form container - ls-form-group

We think this is better.
Changing names of form field size.
Fixing size of field forms doc.