Replace contributor name with github account.
Replace contributor name with github account.

cpeterso/jemalloc,AndroidExternal/jemalloc,jemalloc/jemalloc-cmake,cpeterso/jemalloc,glandium/jemalloc,cpeterso/jemalloc,glandium/jemalloc,AndroidExternal/jemalloc,jemalloc/jemalloc-cmake,leebaok/jemalloc-4.2.1-readcode,leebaok/jemalloc-4.2.1-readcode,AndroidExternal/jemalloc,glandium/jemalloc,wqfish/jemalloc,wqfish/jemalloc,8l/jemalloc,8l/jemalloc,leebaok/jemalloc-4.2.1-readcode,jemalloc/jemalloc-cmake,glandium/jemalloc,8l/jemalloc,jemalloc/jemalloc-cmake,wqfish/jemalloc,AndroidExternal/jemalloc,wqfish/jemalloc,cpeterso/jemalloc,leebaok/jemalloc-4.2.1-readcode,wqfish/jemalloc,8l/jemalloc