MOBI Out: Fix regression causing missing v-margins

MOBI Output: Fix regression in 0.9.31 that caused vertical margins
specified on some block level elements to be ignored. Fixes #1186533 [Regression: some margins lost when converting to MOBI](https://bugs.launchpad.net/calibre/+bug/1186533)
Converted libiMobileDevice errors to negative numbers to match error reporting.
Remove escapemagazine.pl store
Merge pull request #5 from GRiker/master

Reformatted libiMobileDevice error codes to match reporting values (negative numbers).
Fix string.
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DOCX: Nested tables and block/run table styles
DOCX tables: override processing