File utils refactor and unittests

Create unit test for file utils
closes #25
closes #26

pcbdevice/utils/FileUtils.py

@@ -0,0 +1,30 @@
+import math
+
+class FileUtils:
+	@staticmethod
+	def pbmToCsv(pbmFile, dimensionLineIndex = 2):
+		completeFile = []
+		
+		file = open(pbmFile, 'r')
+		lines = file.readlines()
+		width, height = (int(val) for val in lines[dimensionLineIndex].split())
+		file.close()
+		
+		for line in lines[dimensionLineIndex + 1:]:
+			for val in line.split():
+				completeFile += [int(val)]
+		
+		matrix = [[0 for i in range(width)] for j in range(height)]
+		for index, value in enumerate(completeFile):
+			matrix[math.floor(index / width)][index % width] = value
+		
+		return matrix
+	
+	@staticmethod
+	def saveMatrixToFile(matrix, filePath):
+		with open(filePath, 'w') as f:
+			for x in matrix:
+				for y in x:
+					f.write('%s ' % y )
+				f.write('\n')
+			f.close()