* refactor http download
* use chunk_size instead of parts
testcase:set chunksize to 5mb
* use template
space
* cleanup
* remove unused include
* check buffer overfllow
* simplify print download speed
* no-cache mode
* fix test cases build error
* space
* don't create cache dir in no-cache mode
* fix errors in test cases
* no_local_cache_
* set the number of connections by chunk_size
* use size_t instead of int64_t
* add test case for no-cache mode
* rename variables
* fix SIGSEGV
* cleanup
* faster decompressBZ2
* always decompress bz2
* add test cases
* prepare for python interface
* fix test cases build error
* continue
* camera_replay: cache remote file
* protected inheritance
* single option name
* TODO
* test_case for LogReader&FrameReader
* fix wrong require
* test case for FileReader
* cleanup test
* test:fix wrong filename
* check cached file's checksum
* fix mkdir permissions err
cleanup filereader
* remove initialize libav network libraries.
dd
* abort all loading if one failed
* cleanup tests
* use threadpool to limit concurrent downloads
* cache more segments
* merge 3 segments for replay
* one segment uses about 100M of memory
* use segments_need_merge.size()
* shutdown
* fix stuck if exit replay before keyboard thread started
* load one segment at a time
* small cleanup
* cleanup filereader
* space
* tiny cleanup
* merge master
* cleanup test cases
* use util:create_directories
* cleanup framereader
