reorganize the directory hierarchies.

add an intermediate directory Part (I, II, III etc.)

The following 3 files are relocated:

	Chapter_2-Getting_Started/Algorithm_Implementation/Insertion-Sort/Insertion-Sort.scm --> I-Foundations/Chapter_2-Getting_Started/Algorithm_Implementation/Insertion-Sort/Insertion-Sort.scm

	Chapter_2-Getting_Started/Algorithm_Implementation/Merge-Sort/Merge-Sort.scm --> I-Foundations/Chapter_2-Getting_Started/Algorithm_Implementation/Merge-Sort/Merge-Sort.scm

	Chapter_4-Divide-and-Conquer/Algorithm_Implementation/Maximum-Subarray/Maximum-Subarray.c --> I-Foundations/Chapter_4-Divide-and-Conquer/Algorithm_Implementation/Maximum-Subarray/Maximum-Subarray.c

Thank you!
							Lawrence X. Amlord
							  Apr 8th, 2014
							  Xi'an, China