use display list
add Page::text() and test it(issue: rendering is slow)
fix bug in Page::updatePageData()
fix deconstruction error
fix compile error
simpleviewer: add function updateTitle
remove unused variable
update mupdf to version 1.4; full support for MSVC
Merge pull request #6 from xiangxw/mupdf1.4

MuPDF 1.4
fix memory error when using Page::renderImage()
update CMake project files
fix bug: rotate rendering error; Page::text() transformation error.
Merge pull request #7 from xiangxw/fix_rotate_rendering

fix bug: rotate rendering error; Page::text() transformation error.
test program with travis
Merge pull request #8 from xiangxw/test_program_with_travis

test program with travis