LineReader class for reading lines from file stream

+ LineReader with test
+ CircularBuffer with test

valgrind --leak-check=full ./library_circularbuffer
==9537== Memcheck, a memory error detector
==9537== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==9537== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==9537== Command: ./library_circularbuffer
==9537== 
==9537== 
==9537== HEAP SUMMARY:
==9537==     in use at exit: 0 bytes in 0 blocks
==9537==   total heap usage: 241 allocs, 241 frees, 42,576 bytes allocated
==9537== 
==9537== All heap blocks were freed -- no leaks are possible
==9537== 
==9537== For counts of detected and suppressed errors, rerun with: -v
==9537== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 2 from 2)

valgrind --leak-check=full ./io_linereader
==9542== Memcheck, a memory error detector
==9542== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==9542== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==9542== Command: ./io_linereader
==9542== 
==9542== 
==9542== HEAP SUMMARY:
==9542==     in use at exit: 0 bytes in 0 blocks
==9542==   total heap usage: 374 allocs, 374 frees, 49,045 bytes allocated
==9542== 
==9542== All heap blocks were freed -- no leaks are possible
==9542== 
==9542== For counts of detected and suppressed errors, rerun with: -v
==9542== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 2 from 2)