Fix USX corpus issues

[ddaspit]

• Fix incorrect handling of descriptive titles
• Add support for tables

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This change is 

[johnml1135]

Is this issue in Machine as well?

[johnml1135]

tests/corpora/test_usx_memory_text.py line 35 at r1 (raw file):

    <row style="tr">
      <cell style="tc1" align="start"><verse number="1" style="v" />Chapter</cell>
      <cell style="tcr2" align="end">1</cell>

I am assuming that this is how tables are normally defined in USX. Is there any range of how they are defined? Are there edge cases that are not being caught?

[johnml1135]

Reviewed 7 of 7 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @ddaspit)