Apache POI fixes/ extra table commands

- deleted get-page-name, get-column-names, get-rows-data commands (they
can be replaced with get command)
* fixes in write-excel-file, read-excel-file, list-as-table-data
commands
+ added get-excel-cells, get-excel-range, set-excel-cells commands
* switched to java 1.7 and refactored ExcelFileService
49 files changed