Added analgamation script

Author: xelatihy

CONTRIBUTORS

@@ -3,3 +3,4 @@ Maksim Kita
 Marcin Wojdyr
 Neal Richardson
 Tim Paine
+Fabio Pellacini

script/amalgamate.py

@@ -0,0 +1,56 @@
+# text parts
+processed_files = { }
+
+# authors
+for filename in ['AUTHORS', 'CONTRIBUTORS']:
+  with open(filename) as f:
+    text = ''
+    for line in f:
+      if filename == 'AUTHORS':
+        text += '// fast_float by ' + line
+      if filename == 'CONTRIBUTORS':
+        text += '// with contributions from ' + line
+    processed_files[filename] = text
+
+# licenses
+for filename in ['LICENSE-MIT', 'LICENSE-APACHE']:
+  with open(filename) as f:
+    text = ''
+    for line in f:
+      text += '// ' + line
+    processed_files[filename] = text
+
+# code
+for filename in [ 'fast_float.h', 'float_common.h', 'ascii_number.h', 
+                  'fast_table.h', 'decimal_to_binary.h', 'ascii_number.h', 
+                  'simple_decimal_conversion.h', 'parse_number.h']:
+  with open('include/fast_float/' + filename) as f:
+    text = ''
+    for line in f:
+      if line.startswith('#include "'): continue
+      text += line
+    processed_files[filename] = text
+
+# command line
+import argparse
+
+parser = argparse.ArgumentParser(description='Amalgamate fast_float.')
+parser.add_argument('--license', default='MIT', help='choose license')
+parser.add_argument('--output', default='', help='output file (stdout if none')
+
+args = parser.parse_args()
+
+text = '\n\n'.join([
+  processed_files['AUTHORS'], processed_files['CONTRIBUTORS'], 
+  processed_files['LICENSE-' + args.license],
+  processed_files['fast_float.h'], processed_files['float_common.h'], 
+  processed_files['ascii_number.h'], processed_files['fast_table.h'],
+  processed_files['decimal_to_binary.h'], processed_files['ascii_number.h'],
+  processed_files['simple_decimal_conversion.h'],
+  processed_files['parse_number.h']])
+
+if args.output:
+  with open(args.output, 'wt') as f:
+    f.write(text)
+else:
+  print(text)