[Ur] Few patches

[Sergey Mironov]

Hi. I have three less-important patches for the Ur/Web I didn't sent
to this list. Here they are:

1_of_3_Add_basic_support_for__meta__tag.patch

Enables <meta> tag which is used in some Bootstrap examples

2_of_3_Add__role__data_attribute_.patch

Adds role=String attribute to every tag. Again, used by the
Bootstrap's javascript library.

3_of_3_Check_realloc_s_return_code_to_prevent_segfault_on_out_of_memoty_condition.patch

Just an obvious fix.

Please, review and apply if you find they are OK

Regards,
Sergey
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