1.modified Excel2Html.java to ExcelToHtml.java
2.moditied Word2Html.java to WordToHtml.java
3.remove cameraToPdf
4.improve exception handle in WordToHtml.java and ExcelToHtml.java
5.add TextReaderActivity for show text file
6.fix chinese show problem
7.add word excel txt file show to application
Merge branch 'master' of https://github.com/TopLittelbob/AndroidReader