Added log entry to indicate possible password expiration

Lame solution, but that's enough for now :)
Initial implementation: necessary data is placed into XLSX file

TODO: add formatting
Implemented export to XLSX Excel format

However ODS is still default despite google doesn't accept result spreadsheet
Rebuilt Gemfile.lock to have newer rubyzip dependency for axlsx

Also changed source of rubiod gem
Moved styles to document metadata, XLSX export minor refactoring

Refactored document styling:
- move style rescription to document metadata (under :style key)
- disable style caching, otherwise there was no ability to have
different doc styles on different sheets

TODO move report description to config file